Automatic train operation
{{Short description|Types, methods and safety}}
{{Other uses of|ATO}}
{{Automated track-bound traffic}}
Automatic train operation (ATO) is a method of operating trains automatically where the driver is not required or required for supervision at most.{{cite web |title=IEC 60050 - International Electrotechnical Vocabulary - Details for IEV number 821-09-01: "automatic train operation" |url=https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=821-09-01 |website=www.electropedia.org |access-date=23 January 2024}} Alternatively, ATO can be defined as a subsystem within the automatic train control, which performs any or all of functions like programmed stopping, speed adjusting, door operation, and similar otherwise assigned to the train operator.{{cite book |title=IEEE Standard for Communications-Based Train Control (CBTC) Performance and Functional Requirements |url=https://ieeexplore.ieee.org/document/1405808 |doi=10.1109/IEEESTD.2004.95746 |isbn=0-7381-4487-8 |access-date=28 January 2024 }}
File:Cab of T251 set 2037.jpg train serving the Mass Rapid Transit's Thomson–East Coast Line in Singapore. This line runs under ATO GoA 4, which is automatically controlled without any on-board staff.]]
The degree of automation is indicated by the Grade of Automation (GoA), up to GoA4 in which the train is automatically controlled without any staff on board.{{cite news |title=Thales and Knorr-Bremse will jointly develop ATO for freight trains |url=https://www.railtech.com/rolling-stock/2022/11/04/thales-and-knorr-bremse-will-jointly-develop-ato-for-freight-trains/ |access-date=5 March 2023 |work=RailTech.com |date=4 November 2022}} On most systems for lower grades of automation up to GoA2, there is a driver present to mitigate risks associated with failures or emergencies. Driverless automation is primarily used on automated guideway transit systems where it is easier to ensure the safety due to isolated tracks. Fully automated trains for mainline railways are an area of research.{{cite news |title=Europe's ERTMS dream enters a new era |url=https://www.railjournal.com/analysis/europes-ertms-dream-enters-a-new-era/ |access-date=5 March 2023 |work=International Railway Journal}} The first driverless experiments in the history of train automation date back to 1920s.{{cite book |last1=Liu |first1=Hui |title=Unmanned driving systems for smart trains |date=2021 |location=Amsterdam |isbn=9780128228302}}
Grades of automation
{{anchor|Grades of Automation}}
{{see also|List of semi-automatic train systems|List of driverless train systems}}
File:ETCS L3 en.svg Level 3 as an example for GoA2]]
According to the International Association of Public Transport (UITP) and the international standard IEC 62290-1, there are five Grades of Automation (GoA) of trains.{{Cite web| url=http://www.uitp.org/sites/default/files/Metro%20automation%20-%20facts%20and%20figures.pdf| title=A global bid for automation: UITP Observatory of Automated Metros confirms sustained growth rates for the coming years| author=International Association of Public Transport| location=Belgium| access-date=2014-06-08| archive-date=2016-05-01| archive-url=https://web.archive.org/web/20160501034433/http://www.uitp.org/sites/default/files/Metro%20automation%20-%20facts%20and%20figures.pdf| url-status=dead}}{{Cite web| url=http://www.railway-technology.com/features/feature127703| title=Justifying automation| author=Elisabeth Fischer| date=23 August 2011| work=Railway-Technology.com}}{{Cite web |title=IEC 62290-1:2014 – IEC-Normen – VDE VERLAG |url=https://www.vde-verlag.de/iec-normen/220959/iec-62290-1-2014.html |website=www.vde-verlag.de |access-date=2 May 2022}} These levels correspond with the automotive SAE J3016 classification:{{Cite news |title=Cross-Domain Fertilisation in the Evolution towards Autonomous Vehicles |url=https://ercim-news.ercim.eu/en109/special/cross-domain-fertilisation-in-the-evolution-towards-autonomous-vehicles |access-date=8 May 2022 |work=ercim-news.ercim.eu |agency=ERCIM News}}{{Cite journal |last1=Nießen |first1=Nils |last2=Schindler |first2=Christian |last3=Vallee |first3=Dirk |title=Assistierter, automatischer oder autonomer Betrieb – Potentiale für den Schienenverkehr |journal=Verkehr & Betrieb |date=2017 |url=https://www.via.rwth-aachen.de/downloads/04_17_Niessen_Schindler_Vallee.pdf}}
class="wikitable"
! Grade of automation ! Train operation ! Description and examples ! SAE levels |
GoA0
| On-sight | No automation | 0 |
GoA1
| Manual | A train driver controls starting and stopping, operation of doors and handling of emergencies or sudden diversions. Overseen signals due to human errors are safeguarded by train protection systems like ETCS L1.{{Cite book |last1=Passerini |first1=G. |title=Computers in Railways XVII Railway Engineering Design and Operation. |date=2020 |publisher=WIT Press |location=Southampton |isbn=978-1-78466-403-9 |url=https://books.google.com/books?id=Le_6DwAAQBAJ}} | 1 |
GoA2
| Semi-automatic (STO) | Starting and stopping are automated using advanced train protection systems like ETCS L2 or 3,{{Cite book |last1=Peleska |first1=Jan |last2=Haxthausen |first2=Anne E. |last3=Lecomte |first3=Thierry |title=Leveraging Applications of Formal Methods, Verification and Validation. Practice |chapter=Standardisation Considerations for Autonomous Train Control |series=Lecture Notes in Computer Science |date=2022 |volume=13704 |pages=286–307 |doi=10.1007/978-3-031-19762-8_22 |publisher=Springer Nature Switzerland |isbn=978-3-031-19761-1 |language=en|doi-access=free }} but a driver operates the doors, drives the train if needed and handles emergencies. Many ATO systems are GoA2. In this system, trains run automatically from station to station but a driver is in the cab, with responsibility for door closing, obstacle detection on the track in front of the train and handling of emergency situations. As in a GoA3 system, the GoA2 train cannot operate safely without the staff member on board. Examples include the London Underground's Victoria line and New York City Subway's 7 route. | 2 |
GoA3
| {{anchor|Driverless train operation}} Driverless (DTO) | Starting and stopping are automated, but a train attendant operates the doors and drives the train in case of emergencies. In this system, trains run automatically from station to station but a staff member is always in the train, with responsibility for handling of emergency situations. In a GoA3 system, the train cannot operate safely without the staff member on board. Examples include the Docklands Light Railway. | 3 and 4 |
GoA4
| {{anchor|Unattended train operation}} Unattended (UTO) | Starting, stopping and operation of doors are all fully automated without any on-train staff. It is recommended that stations have platform screen doors installed. In this system, trains are capable of operating automatically at all times, including door closing, obstacle detection and emergency situations. On-board staff may be provided for other purposes, e.g. customer service, but are not required for safe operation. Controls are often provided to drive the train manually in the event of a computer failure. CBTC is considered a basic enabler technology for GoA4. Examples include the Vancouver Skytrain, Singapore MRT, Milan Metro line 5, Milan Metro line 4, Line C (Rome Metro), Turin Metro, Brescia Metro, Paris metro lines 1, 4 and 14, Barcelona Metro line 9, Sydney Metro, Dubai Metro, Doha Metro, Riyadh Metro, Nuremberg Metro lines 2 and 3, the Copenhagen Metro, Honolulu Skyline, Delhi Metro Magenta/Pink/Grey Lines and the Suzhou Rail Transit line 11. | 5 |
= Additional types =
Operation of ATO
File:Grand Central Shuttle platform in 1962.jpeg at track 4 of the 42nd Street Shuttle (right) in 1962]]
Many modern systems are linked with automatic train protection (ATP) and, in many cases, automatic train control (ATC) where normal signaling operations such as route setting and train regulation are carried out by the system. The ATC and ATP systems will work together to maintain a train within a defined tolerance of its timetable. The combined system will marginally adjust operating parameters such as the ratio of power to coasting when moving and station dwell time in order to adhere to a defined timetable.{{cn|date=May 2023}}
Whereas ATP is the safety system that ensures a safe spacing between trains and provides sufficient warning as to when to stop. ATO is the "non-safety" part of train operation related to station stops and starts, and indicates the stopping position for the train once the ATP has confirmed that the line is clear.{{cn|date=May 2023}}
The train approaches the station under clear signals, so it can do a normal run-in. When it reaches the first beacon – originally a looped cable, now usually a fixed transponder – a station brake command is received by the train. The on-board computer calculates the braking curve to enable it to stop at the correct point, and as the train runs in towards the platform, the curve is updated a number of times (which varies from system to system) to ensure accuracy.{{Cite web|url=http://www.railway-technical.com/sigtxt4.shtml|title=ATO|website=Railway Technical Web Page|url-status=dead |archive-url= https://web.archive.org/web/20120412091205/http://www.railway-technical.com/sigtxt4.shtml|archive-date=12 April 2012}}
When the train has stopped, it verifies that its brakes are applied and checks that it has stopped within the door-enabling loops. These loops verify the position of the train relative to the platform and which side the doors should open. Once all this is complete, the ATO will open the doors. After a set time, predetermined or varied by the control centre as required, the ATO will close the doors and automatically restart the train if the door closed proving circuit is complete. Some systems have platform screen doors as well. ATO will also provide a signal for these to open once it has completed the on-board checking procedure. Although described here as an ATO function, door enabling at stations is often incorporated as part of the ATP equipment because it is regarded as a "vital" system and requires the same safety validation processes as ATP.
Once door operation is completed, ATO will accelerate the train to its cruising speed, allow it to coast to the next station brake command beacon and then brake into the next station, assuming no intervention by the ATP system.
= Advantages of GoA3+ =
In 2021, the Florida Department of Transportation funded a review by scientists from Florida State University, University of Talca and Hong Kong Polytechnic University, which showed the following advantages of autonomous trains:{{Cite journal |last1=Singh |first1=Prashant |last2=Dulebenets |first2=Maxim A. |last3=Pasha |first3=Junayed |last4=Gonzalez |first4=Ernesto D. R. Santibanez |last5=Lau |first5=Yui-Yip |last6=Kampmann |first6=Raphael |title=Deployment of Autonomous Trains in Rail Transportation: Current Trends and Existing Challenges |journal=IEEE Access |date=2021 |volume=9 |pages=91427–91461 |doi=10.1109/ACCESS.2021.3091550 |s2cid=235749326 |issn=2169-3536|doi-access=free |bibcode=2021IEEEA...991427S |hdl=10397/92123 |hdl-access=free }}
- Eliminating human sources of errors
- Increasing capacity by stronger utilisation of existing rail tracks
- Reduction of operational costs. Paris Métro reduced its operational costs in case of GoA 4 by 30%.{{Cite journal |last1=Cohen |first1=J. M. |last2=Barron |first2=A. S. |last3=Anderson |first3=R. J. |last4=Graham |first4=D. J. |title=Impacts of Unattended Train Operations (UTO) on Productivity and Efficiency in Metropolitan Railways |journal=National Academy of Sciences|url=https://core.ac.uk/display/77007368}}
- Increasing overall service reliability
- Improving fleet management and service flexibility
- Increasing energy efficiency
= Accidents and incidents involving ATO =
While ATO has been proven to drastically reduce the chance of human errors in railway operation, there have been a few notable accidents involving ATO systems:
ATO research projects
Future
In October 2021, the pilot project of the "world's first automated, driverless train" on regular tracks shared with other rail traffic was launched in Hamburg, Germany. The conventional, standard-track, non-metro train technology could, according to reports, theoretically be implemented for rail transport worldwide and is also substantially more energy efficient.{{Cite news |title=Germany unveils first self-driving train |url=https://techxplore.com/news/2021-10-germany-unveils-self-driving.html |access-date=15 November 2021 |work=techxplore.com |language=en}}{{Cite news |title=Germany: Hamburg gets first fully automated tram {{!}} DW {{!}} 11 October 2021 |url=https://www.dw.com/en/germany-hamburg-gets-first-fully-automated-tram/a-59470896 |access-date=15 November 2021 |work=Deutsche Welle (www.dw.com)}}
ATO was introduced on the London Underground's Circle, District, Hammersmith & City, and Metropolitan lines by 2022. ATO is used on parts of Crossrail. Trains on the central London section of Thameslink were the first to use ATO on the UK mainline railway network{{Cite news|title=Thameslink first with ATO over ETCS|url=https://www.railwaygazette.com/news/traction-rolling-stock/single-view/view/thameslink-first-with-ato-over-etcs.html|agency=Railway Gazette|date=20 March 2018}} with ETCS Level 2.
In April 2022, JR West announced that they would test ATO on a 12-car W7 series Shinkansen train used on the Hokuriku Shinkansen at the Hakusan General Rolling Stock Yard during 2022.{{Cite news|date=25 April 2022 |title=JR West to test ATO on W7 series Shinkansen |url=https://www.railjournal.com/passenger/high-speed/jr-west-to-test-ato-on-w7-series-shinkansen/ |work=International Railway Journal |access-date=28 April 2022}}
The U-Bahn in Vienna was scheduled to be equipped with ATO in 2023 on the new U5 line.
All lines built for the new Sydney Metro feature driverless operation without any staff in attendance.
From 2012, the Toronto subway underwent signal upgrades in order to use ATO and ATC over the next decade.{{Cite web | url = http://www.ttc.ca/PDF/About_the_TTC/yonge_subway_extension_recommended_concept_project_issues_de.pdf | title = Yonge Subway Extension – Recommended Concept/Project Issues | date = 2008-12-17 | first = Charles | last = Wheeler | publisher = TTC }} Work has been completed on sections Yonge–University line.{{Cite web|title=Rail News – TTC extends signal system to Queen Station. For Railroad Career Professionals|url=https://www.progressiverailroading.com/c_s/news/TTC-extends-signal-system-to-Queen-Station--59811|access-date=2020-12-12|website=Progressive Railroading|language=en}} The underground portion of Line 5 Eglinton was equipped with ATC and ATO in 2022. The underground portion will use a GoA2 system while the Eglinton Maintenance and Storage Facility will use a GoA4 system and travel driverless around the yard.{{Cite web |title=How will the Eglinton Crosstown LRT's automatic train control work? We break down every major element in an infographic |date=9 December 2019 |url=https://blog.metrolinx.com/2019/12/09/how-will-the-eglinton-crosstown-lrts-automatic-train-control-work-we-break-down-every-major-element-in-an-infographic/ |access-date=4 June 2020}} The Ontario Line is proposed have a GoA4 driverless system and will open in 2030.{{Cite web |title=Ontario Line will be driven by proven tech rather than futuristic prototypes |date=10 September 2019 |url=https://blog.metrolinx.com/2019/09/10/ontario-line-will-be-driven-by-proven-tech-rather-than-futuristic-prototypes/ |access-date=4 June 2020}}
Since March 2021, SNCF and Hauts-de-France region have begun an experimentation with a French Regio 2N Class, {{ill|equipped with sensors and software|fr|Regio 2N#ATO|vertical-align=sup}} (fr).
In 2025, regular driverless passenger services on the line from Kopidlno to Dolní Bousov will be resumed by AŽD Praha.{{cite news |title=LOK Report - Tschechien: AŽD will Kopidlno - Dolní Bousov im Jahr 2025 autonom betreiben |url=https://www.lok-report.de/news/europa/item/46482-tschechien-azd-will-kopidlno-dolni-bousov-im-jahr-2025-autonom-betreiben.html |access-date=23 March 2024 |work=www.lok-report.de |language=de-de}}
See also
- Automation of the London Underground
- Communications-based train control – A moving block signalling system that can be used to automate operation of trains
- One-person operation – A method of train operation, sometimes seen as an intermediate step towards greater automation
- Signaling of the New York City Subway#Automation
- Train automatic stopping controller – An automatic braking system used on some Japanese railway lines, can also be combined with ATO as its auto-braking function
- Vehicular automation
- Guided bus
- Autonomous Rail Rapid Transit (ART)
References
{{Reflist|30em}}
External links
- [https://www.youtube.com/watch?v=Zc08c9u4KWM Tests of train obstacle detection system], project Robotrain, AZD Praha
{{Automated trains and fixed-guideway transit}}
{{Mobile robots}}
{{DEFAULTSORT:Automatic Train Operation}}