CP Class 1550

{{one source|date=February 2017}}

{{Infobox locomotive

| name = Class 1550

| image = CP 1550 Series locomotive in Tunes Train Station, Portugal - 20080416.jpg

| alt =

| caption = Locomotive 1569 at Tunes railway station in 2008

| powertype = Diesel-electric

| designer =

| builder = Montreal Locomotive Works

| ordernumber =

| serialnumber =

| buildmodel = MX 620

| builddate =

| totalproduction =

| rebuilder =

| rebuilddate =

| numberrebuilt =

| aarwheels =

| uicclass =

| Britishclass =

| driver =

| gauge = {{track gauge|1668mm|lk=on}}

| trucks =

| bogies =

| leadingdiameter =

| wheeldiameter =

| trailingdiameter =

| minimumcurve =

| wheelbase =

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| truck =

| bogie =

| tender total =

| tendertruck =

| tenderbogie =

| pivotcentres =

| wheelspacing =

| length =

| over couplers =

| over bufferbeams=

| body =

| width =

| height =

| axleload =

| leadingbogie/pony=

| weightondrivers =

| trail bogie/pony =

| locoweight =

| fueltype =

| fuelcap =

| lubecap =

| coolantcap =

| watercap =

| sandcap =

| powersupply =

| consumption =

| watercons =

| primemover =

| rpmrange =

| rpmrange low =

| rpmrange idle =

| rpmrange max =

| enginetype =

| aspiration =

| displacement =

| alternator =

| generator =

| tractionmotors =

| t/m amps 1 hr =

| t/m amps cont =

| headendpower =

| cylindercount =

| cylindersize =

| transmission =

| gear ratio =

| multipleworking =

| trainheating =

| locobrakes =

| dynamicpeakeffort=

| locobrakeforce =

| trainbrakes =

| reservoircap =

| compressorcap =

| exhaustercap =

| coupling =

| maxspeed =

| poweroutput =

| poweroutput start=

| poweroutput 1 hr=

| poweroutput cont=

| tractiveeffort =

| t/e starting =

| t/e 1 hr =

| t/e continuous =

| factorofadhesion =

| f/adh starting =

| f/adh 1 hr =

| f/adh continuous=

| safety =

| operator = Comboios de Portugal

| operatorclass = Série 1550

| powerclass =

| numinclass =

| fleetnumbers =

| officialname =

| nicknames =

| axleloadclass =

| locale = Portugal

| deliverydate =

| firstrundate = 1973

| lastrundate =

| retiredate =

| withdrawndate =

| preservedunits =

| restoredate =

| scrapdate =

| currentowner =

| disposition =

| notes =

}}

The Série 1550 are a series of 19 diesel-electric locomotives built for the Portuguese Railways (CP). They entered service in 1973; they were built in Canada by the Montreal Locomotive Works (MLW).{{cite web| url=http://www.cp.pt/cp/displayPage.do?vgnextoid=87fcd60d8a675010VgnVCM1000007b01a8c0RCRD| title=Série 1550| website=CP official website| archiveurl=https://web.archive.org/web/20090623120949/http://www.cp.pt/cp/displayPage.do?vgnextoid=87fcd60d8a675010VgnVCM1000007b01a8c0RCRD| archivedate=23 June 2009| url-status=dead}} The locomotives are MLW's type MX 620 design.