Pesa Sundeck

File:Bipa.jpg

The first railway bilevel railcars operated in what is now Poland were two bilevel motor railcars of the Thomas system from 1883, belonging to the {{Interlanguage link|Oleśnica–Chojnice railway|pl|Linia kolejowa nr 281}}. The first such vehicle at the Polish State Railways was a railcar designated Breslau 970, which, during the modernization of Berlin's urban railway rolling stock, was transferred around 1912 to the Wrocław directorate. After World War I, it came to Poland and was assigned number 11344 BC. It was scrapped in 1931.{{Cite journal |last=Jeżak |first=Krzysztof |date=2001 |title=Wagony piętrowe na PKP |trans-title=Bilevel railcars at PKP |journal=Świat Kolei |language=pl |location=Łódź |publisher=Emi-Press |volume=5 |issue= |pages=12–17 |issn=1234-5962}}

The first bilevel railcars produced in what is now Poland were manufactured in 1936 by Linke-Hofmann-Busch in Wrocław. After World War II, such vehicles were produced from 1952 for the Deutsche Reichsbahn and from 1959 for other socialist countries by the Waggonbau Görlitz factory. Between 1959 and 1977, Polish State Railways ordered and received a total of 473 four-car units and 57 single railcars, initially designated as the Bipa series, renamed Bhp in 1985. In 1974, Waggonbau Görlitz began serial production of a new type of bilevel railcar, free of the design flaws of earlier models. Between 1988 and 1989, 160 units were delivered to Poland, assigned the series Bdhpumn.

File:Bombardier push-pull Warszawa.jpg

In July 2007, Masovian Railways ordered 11 control cars and 26 intermediate cars from the Twindexx family from Bombardier Transportation. They entered service in September 2008, and in August 2011, Traxx P160 DC locomotives were introduced, enabling the operator to launch Poland's first push-pull trains.{{Cite web |title=Koleje Mazowieckie oraz Bombardier Transportation podpisały umowę na serwis utrzymania floty wagonów piętrowych |trans-title=Koleje Mazowieckie and Bombardier Transportation signed a contract for the maintenance of the double-decker railcar fleet |url=http://www.mazowieckie.com.pl/pl/koleje-mazowieckie-oraz-bombardier-transportation-podpisa-y-umow-na-serwis-utrzymania-floty-wagon-w |archive-url=https://archive.today/20150824081412/http://www.mazowieckie.com.pl/pl/koleje-mazowieckie-oraz-bombardier-transportation-podpisa-y-umow-na-serwis-utrzymania-floty-wagon-w |archive-date=2015-08-24 |access-date= |website=mazowieckie.com.pl |language=pl}}

In September 2013, PKP Intercity announced a tender for the supply of 10 bilevel electric multiple units.{{Cite web |date=2 September 2013 |title=Ogłoszono przetarg na piętrusy dla PKP IC |trans-title=Tender announced for double-deckers for PKP IC |url=http://www.kurier-kolejowy.pl/aktualnosci/15717/Ogloszono-przetarg-na-pietrusy-dla-PKP-IC.html |access-date=2025-04-16 |website=kurier-kolejowy.pl |language=pl}} Six potential contractors applied,{{Cite web |date=13 November 2013 |title=Sześć firm zgłosiło Intercity chęć dostawy pociągów piętrowych |trans-title=Six companies expressed interest in supplying bilevel trains to Intercity |url=http://www.rynek-kolejowy.pl/49235/szesc_firm_zglosilo_intercity_chec_dostawy_pociagow_pietrowych.htm |archive-url=https://web.archive.org/web/20131114082934/http://www.rynek-kolejowy.pl/49235/szesc_firm_zglosilo_intercity_chec_dostawy_pociagow_pietrowych.htm |archive-date=2013-11-14 |access-date= |website=rynek-kolejowy.pl |language=pl}} but the tender was not awarded, and no vehicles were ordered.{{Cite web |date=2 September 2013 |title=Dostawa 10 piętrowych EZT wraz z usługą utrzymania |trans-title=Supply of 10 bilevel EMUs with maintenance services |url=http://intercity.pl/pl/site/o-nas/przetargi/biezace-przetargi/dostawa-10-ezt-20130902/ |archive-url=https://archive.today/20151008114537/http://intercity.pl/pl/site/o-nas/przetargi/biezace-przetargi/dostawa-10-ezt-20130902/ |archive-date=2015-10-08 |access-date= |website=intercity.pl |language=pl}}

In November 2013, after canceling an initial procedure, Masovian Railways announced a new tender for 22 bilevel railcars and 2 locomotives{{Cite web |date=19 November 2013 |title=KM nie rezygnują z zakupu piętrusów |trans-title=KM do not give up on purchasing double-deckers |url=http://www.kurier-kolejowy.pl/aktualnosci/17048/KM-nie-rezygnuja-z-zakupu-pietrusow.html |access-date=2025-04-16 |website=kurier-kolejowy.pl |language=pl}} to form push-pull trains. The tender required compatibility with existing vehicles, so an offer from Bombardier was expected. Ultimately, Bombardier did not participate,{{Cite web |date=6 February 2014 |title=Pesa stworzy dla KM pierwszego w Polsce piętrusa? |trans-title=Will Pesa create Poland's first bilevel for KM? |url=http://www.kurier-kolejowy.pl/aktualnosci/18136/Pesa-stworzy-dla-KM-pierwszego-w-Polsce-pietrusa.html |access-date=2025-04-16 |website=kurier-kolejowy.pl |language=pl}} and the order was awarded to Pesa in Bydgoszcz.{{Cite web |date=23 February 2014 |title=Piętrusy dla Kolei Mazowieckich. Jednak Pesa |trans-title=Bilevels for Koleje Mazowieckie. Pesa after all |url=http://www.kurier-kolejowy.pl/aktualnosci/18362/Pietrusy-dla-Kolei-Mazowieckich-Jednak-Pesa.html |access-date=2025-04-16 |website=kurier-kolejowy.pl |language=pl}}

File:Pesa Sundeck logo.svg

For the 2013 PKP Intercity tender for bilevel trains, Pesa's design office developed a concept for bilevel EMUs. The bilevel railcars offered in the Masovian Railways tender were a modified version, compliant with the requirement to be compatible with Twindexx railcars. The push-pull train is formed with a Gama locomotive. The exterior was designed by {{Interlanguage link|Bartosz Piotrowski|pl|Bartosz Piotrowski}}, the interior by Mariusz Gorczyński and Wojciech Reszeta, and the driver's cab by Mariusz Gorczyński.{{Cite web |date=20 October 2016 |title=Dobry Wzór 2016 » Finaliści » Transport i komunikacja |trans-title=Good Design 2016 » Finalists » Transport and Communication |url=http://www.iwp.com.pl/1955 |archive-url=https://web.archive.org/web/20161020210405/http://www.iwp.com.pl/1955 |archive-date=2016-10-20 |access-date= |website=iwp.com.pl |language=pl}}

Pesa Sundeck railcars are Poland's first bilevel railcars, and with the Pesa Gama locomotive, the first Polish push-pull train. Their name comes from the sunny upper deck.{{Cite web |date=23 September 2015 |title=Pesa zaprezentowała piętrowy skład push&pull |trans-title=Pesa presented a bilevel push-pull train |url=http://inforail.pl/pesa-zaprezentowala-pietrowy-sklad-pushandpull-_more_77757.html |archive-url=https://archive.today/20150929171813/http://inforail.pl/pesa-zaprezentowala-pietrowy-sklad-pushandpull-_more_77757.html |archive-date=2015-09-29 |access-date= |website=inforail.pl |language=pl}}

On 15 April 2014, Masovian Railways signed a contract with Pesa for 2 control cars, 20 intermediate cars, and 2 electric locomotives Gama,{{Cite web |date=15 April 2015 |title=Pesa z umową na piętrusy dla Kolei Mazowieckich |trans-title=Pesa signs contract for bilevels for Koleje Mazowieckie |url=http://www.rynek-kolejowy.pl/51841/pesa_z_umowa_na_pietrusy_dla_kolei_mazowieckich.htm |archive-url=https://web.archive.org/web/20140416184111/http://www.rynek-kolejowy.pl/51841/pesa_z_umowa_na_pietrusy_dla_kolei_mazowieckich.htm |archive-date=2014-04-16 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} with four-year maintenance at Mińsk Mazowiecki Pesa branch.{{Cite journal |last=Kalinowski |first=Dariusz |title=Zespoły zmiennokierunkowe Pesa Sundeck dla Kolei Mazowieckich |trans-title=Pesa Sundeck push-pull trains for Koleje Mazowieckie |journal=Świat Kolei |volume=2/2016 |date=2016-02-01 |pages=12–17 |publisher=Emi-Press |location=Łódź |issn=1234-5962 |language=pl}} Deliveries were set for 15 January to 17 August 2015.{{Cite web |date=19 January 2015 |title=Pierwszy push-pull Pesy powstanie za 3 miesiące |trans-title=Pesa’s first push-pull will be ready in 3 months |url=http://www.kurier-kolejowy.pl/aktualnosci/22860/Pierwszy-push-pull-Pesy-powstanie-za-3-miesiace.html |access-date=2025-04-16 |website=kurier-kolejowy.pl |language=pl}} Pesa stated the first railcars would be ready in January or February 2015, delivered after homologation in June or July.{{Cite web |last=Wach |first=Karol |date=15 April 2015 |title=Pierwszy polski push&pull |trans-title=Poland's first push&pull |url=http://inforail.pl/pierwszy-polski-pushandpull_more_40693.html |archive-url=https://archive.today/20150824081421/http://inforail.pl/pierwszy-polski-pushandpull_more_40693.html |archive-date=2015-08-24 |access-date=2025-04-16 |website=inforail.pl |language=pl}}

In mid-January 2015, vehicle structures and bogies frames were under construction. The intermediate car was planned for completion in March, the control car by April, with testing and approval by July, and deliveries from 3 to 17 August.

By July 2015, the first intermediate car was ready, tested at the Tabor Railway Vehicle Institute. Compatibility issues with Twindexx railcars arose but were resolved, with tests planned with Bombardier stock.{{Cite web |last=Wach |first=Karol |date=10 July 2015 |title=Pierwszy wagon piętrowy z Pesy gotowy |trans-title=Pesa's first bilevel railcar ready |url=https://transinfo.pl/inforail/pierwszy-wagon-pietrowy-z-pesy-gotowy-_more_74841/ |access-date=2025-04-16 |website=inforail.pl |language=pl}} On 14 July, technical runs checked systems, installations, and performance at 160 km/h.{{Cite web |date=14 July 2015 |title=Pierwsze wagony piętrowe Pesy dla KM już na testach (zdjęcia) |trans-title=Pesa's first bilevel railcars for KM already in testing (photos) |url=http://www.rynek-kolejowy.pl/58464/pierwsze_wagony_pietrowe_pesy_dla_km_juz_na_testach_zdjecia.htm |archive-url=https://web.archive.org/web/20150823200037/http://www.rynek-kolejowy.pl/58464/pierwsze_wagony_pietrowe_pesy_dla_km_juz_na_testach_zdjecia.htm |archive-date=2015-08-23 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} From 31 August to 14 September, intermediate car 416B-001, hauled by a Bombardier Traxx, was tested at the Railway Institute's Żmigród track.{{Cite web |date=17 September 2015 |title=First Pesa's Double Decker On Test |url=http://www.railvolution.net/railvolution/hors-doeuvres/first-pesa-s-double-decker-on-test |access-date=2025-04-16 |website=railvolution.net |language=en}} By September, work continued on the second locomotive and more railcars, targeting early December delivery.{{Cite web |date=4 September 2015 |title=Dostawa lokomotyw i wagonów piętrowych dla KM z lekkim opóźnieniem |trans-title=Delivery of locomotives and bilevel railcars for KM slightly delayed |url=http://www.rynek-kolejowy.pl/59246/dostawa_lokomotyw_i_wagonow_pietrowych_dla_km_z_lekkim_opoznieniem.htm |archive-url=https://web.archive.org/web/20150929133839/http://www.rynek-kolejowy.pl/59246/dostawa_lokomotyw_i_wagonow_pietrowych_dla_km_z_lekkim_opoznieniem.htm |archive-date=2015-09-29 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}}

From 22 to 25 September 2015, intermediate car 416B-002 was shown at Trako fair (instead of a full train).{{Cite web |date=21 September 2015 |title=Pociągi już na torach Trako! Zobacz zdjęcia |trans-title=Trains already on Trako tracks! See photos |url=http://www.rynek-kolejowy.pl/59455/pociagi_juz_na_torach_trako_zobacz_zdjecia.htm |archive-url=https://web.archive.org/web/20151009110607/http://www.rynek-kolejowy.pl/59455/pociagi_juz_na_torach_trako_zobacz_zdjecia.htm |archive-date=2015-10-09 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}}{{Cite web |date=1 September 2015 |title=Jaki tabor zobaczymy na Trako? |trans-title=What rolling stock will we see at Trako? |url=https://transinfo.pl/inforail/jaki-tabor-zobaczymy-na-trako-_more_77119/ |access-date=2025-04-16 |website=inforail.pl |language=pl}} Its premiere was on 23 September.{{Cite web |date=23 September 2015 |title=Trako 2015. Zobacz wagony piętrowe Pesa Sundeck (zdjęcia) |trans-title=Trako 2015. See Pesa Sundeck bilevel railcars (photos) |url=http://www.rynek-kolejowy.pl/59492/trako_2015_zobacz_wagony_pietrowe_pesa_sundeck_zdjecia.htm |archive-url=https://web.archive.org/web/20151122191908/http://www.rynek-kolejowy.pl/59492/trako_2015_zobacz_wagony_pietrowe_pesa_sundeck_zdjecia.htm |archive-date=2015-11-22 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} The delivery deadline was set for 7 December.{{Cite journal |last=Sulima |first=Czesław |date=2015 |title=W Kolejach Mazowieckich kończy się era EN57 |trans-title=The era of EN57 is ending at Koleje Mazowieckie |journal=Rynek Kolejowy |language=pl |location=Warsaw |publisher=TOR |volume=11 |page=46 |issn=1644-1958}}

On 5 October 2015, a train with a Gama locomotive and Sundeck railcars (111Eb-001+416B-001+416B-002+316B-001) arrived at Żmigród for testing from 6 October.{{Cite journal |date=2015 |title=Zahájeny zkoušky vratné soupravy pro KM |trans-title=Testing of the push-pull train for KM begins |journal=Železniční magazín |language=cs |location=Prague |publisher=M-Presse plus |volume=9 |page=9 |issn=1212-1851}}{{Cite web |last=Smith |first=John |date=7 October 2015 |title=KM Double Deck Carriages On Test At Źmigród |url=http://www.railvolution.net/railvolution/hors-doeuvres/km-double-deck-carriages-on-test-at-migrod |archive-url=https://archive.today/20151008001950/http://www.railvolution.net/railvolution/hors-doeuvres/km-double-deck-carriages-on-test-at-migrod |archive-date=2015-10-08 |access-date=2025-04-16 |website=railvolution.net |language=en}} Tests were planned until 24 October, with further tests in Warsaw by 29 October. Testing continued into November, alongside production.{{Cite web |date=4 November 2015 |title=PesaSundeck na testach w Żmigrodzie (film) |trans-title=Pesa Sundeck under testing in Żmigród (video) |url=https://transinfo.pl/inforail/pesasundeck-na-testach-w-zmigrodzie-film-_more_79029/ |access-date=2025-04-16 |website=inforail.pl |language=pl}} By late November, Pesa committed to year-end delivery, with Masovian Railways announcing penalties for delays.{{Cite web |date=26 November 2015 |title=Koleje Mazowieckie: Pesa zapewnia, że dostarczy piętrusy w tym roku |trans-title=Koleje Mazowieckie: Pesa assures bilevels will be delivered this year |url=https://transinfo.pl/inforail/koleje-mazowieckie-pesa-zapewnia-ze-dostarczy-pietrusy-w-tym-roku_more_79650/ |access-date=2025-04-16 |website=inforail.pl |language=pl}}

On 9 December 2015, the Office of Rail Transport issued certificate T/2015/0100 for intermediate cars 416B,{{Cite web |last=Dyl |first=Krzysztof |date=9 December 2015 |title=Świadectwo Nr T/2015/0100 dopuszczenia do eksploatacji typu pojazdu kolejowego |trans-title=Certificate No. T/2015/0100 for type approval of railway vehicle |url=http://swiadectwa.utk.gov.pl/utk/obrazblob.php?name2=1e2c2903-bf81-11e5-87b8-005056a05e42&stronka=1 |access-date=2025-04-16 |website=swiadectwa.utk.gov.pl |language=pl}} and on 17 December, certificate T/2015/0105 for control cars 316B.{{Cite web |last=Dyl |first=Krzysztof |date=17 December 2015 |title=Świadectwo Nr T/2015/0105 dopuszczenia do eksploatacji typu pojazdu kolejowego |trans-title=Certificate No. T/2015/0105 for type approval of railway vehicle |url=http://swiadectwa.utk.gov.pl/utk/obrazblob.php?name2=a76e2b54-cc1a-11e5-87b8-005056a05e42&stronka=1 |access-date=2025-04-16 |website=swiadectwa.utk.gov.pl |language=pl}} That day, all railcars were completed, compatible with Bombardier's.{{Cite web |date=17 December 2015 |title=Wszystkie push&pulle dla Kolei Mazowieckich wyprodukowane |trans-title=All push-pulls for Koleje Mazowieckie produced |url=http://inforail.pl/wszystkie-pushandpulle-dla-kolei-mazowieckich-wyprodukowane-_more_80273.html |archive-url=https://archive.today/20151217123206/http://inforail.pl/wszystkie-pushandpulle-dla-kolei-mazowieckich-wyprodukowane-_more_80273.html |archive-date=2015-12-17 |access-date=2025-04-16 |website=inforail.pl |language=pl}} On 18 December, 9 intermediate cars and 1 control car were accepted, starting test runs.{{Cite web |date=21 December 2015 |title=Pesa Sundecki-i muszą się rozjeździć |trans-title=Pesa Sundecks need to be broken in |url=https://transinfo.pl/inforail/pesasundeck-i-musza-sie-rozjezdzic-_more_80358/ |access-date=2025-04-16 |website=inforail.pl |language=pl}} Driver training was ongoing.{{Cite web |date=18 December 2015 |title=Pierwsze piętrowe wagony Sundeck odebrane przez Koleje Mazowieckie |trans-title=First Sundeck bilevel railcars accepted by Koleje Mazowieckie |url=http://www.rynek-kolejowy.pl/60726/pierwsze_pietrowe_wagony_sundeck_odebrane_przez_koleje_mazowieckie.htm |archive-url=https://web.archive.org/web/20151222093942/http://www.rynek-kolejowy.pl/60726/pierwsze_pietrowe_wagony_sundeck_odebrane_przez_koleje_mazowieckie.htm |archive-date=2015-12-22 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} On 23 December, 4 intermediate cars, and on 29 December, 3 more were accepted. On 30 December, the final 4 intermediate cars and second control car completed the order.{{Cite web |date=30 December 2015 |title=Wszystkie wagony piętrowe Sundeck i lokomotywy Gama odebrane przez KM |trans-title=All Sundeck bilevel railcars and Gama locomotives accepted by KM |url=http://www.rynek-kolejowy.pl/60869/wszystkie_wagony_pietrowe_sundeck_i_lokomotywy_gama_odebrane_przez_km.htm |archive-url=https://web.archive.org/web/20160117020229/http://www.rynek-kolejowy.pl/60869/wszystkie_wagony_pietrowe_sundeck_i_lokomotywy_gama_odebrane_przez_km.htm |archive-date=2016-01-17 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}}

On 13 January 2016, all Sundeck railcars and Gama locomotives were officially handed over at Warszawa Wschodnia railway station,{{Cite web |date=13 January 2016 |title=Sundecki wyjadą na trasy w ciągu kilku dni |trans-title=Sundecks will hit the routes in a few days |url=http://www.inforail.pl/sundecki-wyjada-na-trasy-w-ciagu-kilku-dni_more_80806.html |archive-url=https://web.archive.org/web/20160818221621/http://www.inforail.pl/sundecki-wyjada-na-trasy-w-ciagu-kilku-dni_more_80806.html |archive-date=2016-08-18 |access-date=2025-04-16 |website=inforail.pl |language=pl}} with a trip to Warszawa Rembertów railway station.{{Cite web |date=13 January 2016 |title=Pierwsze polskie „push-pulle” już wkrótce na szlakach Mazowsza |trans-title=Poland's first “push-pulls” soon on Mazovia's routes |url=http://www.mazowieckie.com.pl/pl/pierwsze-polskie-push-pulle-juz-wkrotce-na-szlakach-mazowsza |access-date=2025-04-16 |website=mazowieckie.com.pl |language=pl}}

Pesa Sundeck railcars are bilevel, non-compartment second-class cars.{{Cite web |last= |first= |date= |title=Składy piętrowe |trans-title=Bilevel trains |url=http://www.pesa.pl/produkty/sklady-pietrowe/ |archive-url=https://web.archive.org/web/20150926013501/http://www.pesa.pl/produkty/sklady-pietrowe/ |archive-date=2015-09-26 |access-date= |website=pesa.pl |language=pl}} In the standard setup, they form a push-pull train with a locomotive, 6 intermediate cars type 416B, and a control car type 316B.{{Cite web |last= |first= |date=16 April 2014 |title=Jakie piętrusy i Gamy dla Kolei Mazowieckich? |trans-title=What bilevels and Gamas for Koleje Mazowieckie? |url=http://www.rynek-kolejowy.pl/51852/jakie_pietrusy_i_gamy_dla_kolei_mazowieckich.htm |archive-url=https://web.archive.org/web/20140417022950/http://www.rynek-kolejowy.pl/51852/jakie_pietrusy_i_gamy_dla_kolei_mazowieckich.htm |archive-date=2014-04-17 |access-date= |website=rynek-kolejowy.pl |language=pl}} This configuration carries 1,700 passengers. The operating speed is 160 km/h. They can be coupled with Bombardier Twindexx cars in configurations:

• Pesa locomotive and control car with Bombardier intermediate cars,
• Bombardier locomotive and control car with Pesa intermediate cars.

The railcars have a welded steel body and cladding with anti-graffiti coating. Each has two pairs of sliding plug doors per side, 1,300 mm wide.

Inter-car passages are protected by rubber bellows. Inter-car doors, 500 mm wide, are electrically operated with a button and have a reversing mechanism if obstructed.

The control car's front has buffers with energy-absorbing elements. External rear-view cameras replace mirrors, and a route-recording camera is installed.

Air conditioning units and a voltage converter are housed in roof recesses at each end.

The interior features air conditioning, forced-air heating, CCTV, and Wi-Fi.{{Cite journal |last=Kalinowski |first=Dariusz |date=2015 |title=Tabor szynowy na targach Trako 2015 |trans-title=Rail rolling stock at Trako 2015 fair |journal=Świat Kolei |language=pl |location=Łódź |publisher=Emi-press |volume=10 |issue= |pages=12–19 |issn=1234-5962}} Lighting uses two rows of fluorescent lamps in ceiling recesses. The passenger information system includes GPS-based next-stop location, shown on LED displays, with crew announcement capability. Intercoms are near entrances, and passenger-counting sensors are above doors. Handrails are integrated into wall recesses for wider passages. All cars have coat hooks and yellow-blue warning stripes under the ceiling.{{Cite web |last= |first= |date=13 January 2016 |title=Wagony Sundeck i lokomotywy Gama oficjalnie przekazane Kolejom Mazowieckim (zdjęcia) |trans-title=Sundeck railcars and Gama locomotives officially handed over to Koleje Mazowieckie (photos) |url=http://www.rynek-kolejowy.pl/61088/wagony_sundeck_i_lokomotywy_gama_oficjalnie_przekazane_kolejom_mazowieckim_zdjecia.htm |archive-url=https://web.archive.org/web/20160113192332/http://www.rynek-kolejowy.pl/61088AMS/wagony_sundeck_i_lokomotywy_gama_oficjalnie_przekazane_kolejom_mazowieckim_zdjecia.htm |archive-date=2016-01-13 |access-date= |website=rynek-kolejowy.pl |language=pl}} Each car has evacuation ladders.

Most seating is in a facing-row layout, with each seatback featuring a foldable wooden table and magazine pocket. Each deck and the intermediate car's middle deck have two pairs of facing seats with foldable tables. Near the upper-deck stairs of intermediate cars, two foldable seats are installed. Wall-side armrests are fixed, others are movable. Waste bins are under seats by the central aisle. Each seat pair has one power socket. Seats are numbered, with reservation slots near luggage racks. Standing passenger handles have seat numbers in numbers and Braille.

Each intermediate car's middle deck has a toilet and is pre-fitted for future snack and ticket machines. They lack luggage racks.

The control car's lower deck has a bar table with three swivel chairs, pre-fitted for a snack machine. Both decks have two luggage racks. The middle deck near the inter-car passage has a multi-purpose area for two wheelchairs or three bicycles, with an accessible toilet and lifts at nearby doors. Accessibility features meet TSI standards. Near the driver's cab is a lockable crew compartment with a table, foldable seat, wardrobe, and socket. Opposite is a cabinet for electrical and pneumatic equipment. The driver's cab mirrors the Pesa Gama type 111Eb, with minor button layout differences, and includes a kettle, fridge, and storage. The front window has two wipers and resistive heating. All cab windows have blinds.

Some windows are tiltable, locked when air conditioning is on. Upper-deck windows have sun blinds.

The entrance vestibule floor, one step up from the door, is 1,060 mm above the rail. Platforms from 300 to 1,060 mm are served with two extendable steps per entrance. Stairs lead to upper and lower decks, and a sloped floor to middle decks.

{{Gallery

|File:Pesa Sundeck - dolny pokład (2) Trako 2015 (Flyz1 WG 34-2015).jpg|Lower deck

|File:Pesa Sundeck - dolny pokład (3) Trako 2015 (Flyz1 WG 34-2015).jpg|Intermediate deck

|File:416B-002 - górny pokład, Trako 2015, 2015-09-24 (Muri WG 2015-34).jpg|Upper deck

|File:416B-017 - toaleta, Przekazanie KM push-pulli Pesy, 2016-01-13.jpg|Toilet

|title=Intermediate car}}

{{Gallery

|File:316B-002 - kokpit, Przekazanie KM push-pulli Pesy, 2016-01-13.jpg|Driver’s desk

|File:316B-002 - przedział gastronomiczny, Przekazanie KM push-pulli Pesy, 2016-01-13.jpg|Bar area

|File:316B-002 - rampa, Przekazanie KM push-pulli Pesy, 2016-01-13.jpg|Wheelchair ramp

|File:316B-002 - toaleta, Przekazanie KM push-pulli Pesy, 2016-01-13.jpg|Toilet

|title=Control car}}

File:416B-002 - wózek, Trako 2015, 2015-09-25 (Muri WG 2015-34).jpg

Each railcar rests on two type 39AN bogies, each with a roll stabilizer, magnetic track brakes, and an anti-slip system. Primary suspension uses coil springs, and the body rests on the bogie frame via air springs maintaining constant floor height. Wheelsets are guided by swing axles. Each wheelset has three brake discs. The bogie under the control car's cab includes a sandbox, wheel flange lubricators, and an SHP electromagnet.

Each railcar's wheelbase is 19,000 mm, bogie wheelbase 2,500 mm, and wheel diameter 920 mm.

Masovian Railways ordered Sundeck bilevel railcars to extend existing bilevel trains and launch new express services from Warsaw to Dęblin, Działdowo, Płock, and Radom. At the contract's signing, routes to Skierniewice and Sochaczew were considered. Later, connections to Wołomin,{{Cite web |last=Nowakowski |first=Piotr |date=9 January 2015 |title=Pierwsze pudło Gamy dla Kolei Mazowieckich odebrane |trans-title=First Gama body for Koleje Mazowieckie accepted |url=http://www.rynek-kolejowy.pl/55330/pierwsze_pudlo_gamy_dla_kolei_mazowieckich_odebrane.htm |archive-url=https://web.archive.org/web/20150711155009/http://www.rynek-kolejowy.pl/55330/pierwsze_pudlo_gamy_dla_kolei_mazowieckich_odebrane.htm |archive-date=2015-07-11 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} Skarżysko-Kamienna, and Łuków were added. Some cars were to enter service in September 2015, with all in use by the December schedule change.{{Cite web |last=Nowakowski |first=Piotr |date=20 November 2014 |title=Koleje Mazowieckie czekają na nowy tabor. Gdzie pojadą piętrusy? |trans-title=Koleje Mazowieckie await new rolling stock. Where will the bilevels go? |url=http://www.rynek-kolejowy.pl/54790/koleje_mazowieckie_czekaja_na_nowy_tabor_gdzie_pojada_pietrusy.htm |archive-url=https://web.archive.org/web/20150711182108/http://www.rynek-kolejowy.pl/54790/koleje_mazowieckie_czekaja_na_nowy_tabor_gdzie_pojada_pietrusy.htm |archive-date=2015-07-11 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} Due to delays, Masovian Railways estimated first-quarter 2016 for operation. After accepting the first cars in December, they planned January 2016. Due to incomplete Office of Rail Transport documentation, this shifted to February.{{Cite web |last=Nowakowski |first=Piotr |date=28 January 2016 |title=Piętrowe wagony Sundeck na torach dopiero w lutym |trans-title=Sundeck bilevel railcars on the tracks only in February |url=http://www.rynek-kolejowy.pl/wiadomosci/pietrowe-wagony-sundeck-na-torach-dopiero-w-lutym-75153.html |archive-url=https://web.archive.org/web/20160204202528/http://www.rynek-kolejowy.pl/wiadomosci/pietrowe-wagony-sundeck-na-torach-dopiero-w-lutym-75153.html |archive-date=2016-02-04 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} Operation began on 31 January 2016.

The railcars initially served express trains:

• Radomiak: Warszawa Wschodnia–Radom and back (6 Sundeck cars, 1 Gama locomotive),
• Wiedenka: Warszawa Wschodnia–Skierniewice and back (5 Sundeck cars, 1 Gama locomotive),
• Łukowianka: Warszawa Zachodnia–Łuków and back (6 Sundeck cars).

Later, they operated the Bolimek express from Warszawa Wschodnia to Żyrardów.{{Cite journal |last=Łukasik |first=Katarzyna |date=2016 |title=Piętrusy w barwach Kolei Mazowieckich |trans-title=Bilevels in Koleje Mazowieckie’s colors |url=http://www.mazovia.pl/downloadStat/gfx/mazovia/pl/mazoviakronika/141/147/1/km_157_calosc.pdf |journal=Kronika Mazowiecka |language=pl |location=Warsaw |publisher=Urząd Marszałkowski Województwa Mazowieckiego |volume=3 |page=16 |issn=1730-749X |archive-url=https://web.archive.org/web/20170308181446/http://www.mazovia.pl/downloadStat/gfx/mazovia/pl/mazoviakronika/141/147/1/km_157_calosc.pdf |archive-date=2017-03-08}}

In the first three months, only intermediate cars had failures, all in February.{{Cite web |last=Nowakowski |first=Piotr |date=5 May 2016 |title=A Gamy Kolei Mazowieckich – niezawodne |trans-title=Koleje Mazowieckie's Gamas – reliable |url=http://www.rynek-kolejowy.pl/wiadomosci/a-gamy-kolei-mazowieckich--niezawodne-76483.html |archive-url=https://web.archive.org/web/20160507172217/http://www.rynek-kolejowy.pl/wiadomosci/a-gamy-kolei-mazowieckich--niezawodne-76483.html |archive-date=2016-05-07 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}} In the first year, issues included heating, air conditioning, and window leaks. Sundecks and Gamas operated in mixed trains with Twindexx and Traxx, as required.{{Cite web |last=Nowakowski |first=Piotr |date=16 February 2017 |title=Rok piętrowych zestawów Pesa Sundeck w Kolejach Mazowieckich |trans-title=A year of Pesa Sundeck bilevel sets at Koleje Mazowieckie |url=http://www.rynek-kolejowy.pl/wiadomosci/rok-pietrowych-zestawow-pesa-sundeck-w-kolejach-mazowieckich-80348.html |archive-url=https://web.archive.org/web/20170216172500/http://www.rynek-kolejowy.pl/wiadomosci/rok-pietrowych-zestawow-pesa-sundeck-w-kolejach-mazowieckich-80348.html |archive-date=2017-02-16 |access-date=2025-04-16 |website=rynek-kolejowy.pl |language=pl}}

• 2016 – Dobry Wzór 2016 award in the Transport and Communication category.{{Cite web |date=20 October 2016 |title=Znamy Laureatów 23. edycji konkursu Dobry Wzór! |trans-title=We know the winners of the 23rd edition of the Good Design competition! |url=http://www.iwp.com.pl/aktualnosc/1777/Znamy_Laureatow_23_edycji_konkursu_Dobry_Wzor_/ |archive-url=https://web.archive.org/web/20161020211817/http://www.iwp.com.pl/aktualnosc/1777/Znamy_Laureatow_23_edycji_konkursu_Dobry_Wzor_/ |archive-date=2016-10-20 |access-date= |website=iwp.com.pl |language=pl}}

Category:Rolling stock of Poland

Category:Passenger railroad cars