SNCF Class BB 63500

{{Infobox locomotive

| name = SNCF BB 63500

| image = BB 63856 Longueau (fête du rail 2019).jpg

| alt = Picture of diesel locomotive

| caption = BB 63856 at Longueau in 2019

| powertype = Diesel-electric

| designer =

| builder = Brissonneau et Lotz

| ordernumber =

| serialnumber =

| buildmodel =

| builddate = 1956–1971

| totalproduction = 580

| rebuilder =

| rebuilddate =

| numberrebuilt =

| website =

| aarwheels = Bo–Bo

| uicclass =

| Britishclass = Bo-Bo

| driver =

| gauge = {{Track gauge|1435mm|allk=on}}

| trucks =

| bogies = 2

| leadingdiameter =

| wheeldiameter = {{cvt|1050|mm}}

| trailingdiameter =

| minimumcurve =

| wheelbase =

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| truck =

| bogie =

| tender total =

| tendertruck =

| tenderbogie =

| pivotcentres =

| wheelspacing =

| length = {{cvt|14.68|m}}

| over couplers =

| over bufferbeams=

| body =

| width =

| height =

| axleload =

| leadingbogie/pony=

| weightondrivers =

| trail bogie/pony =

| locoweight = {{cvt|64–68|t}}

| fueltype = Diesel

| fuelcap =

| lubecap =

| coolantcap =

| watercap =

| sandcap =

| powersupply =

| consumption =

| watercons =

| primemover = MGO V12SH

| rpmrange =

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| displacement =

| alternator =

| generator =

| tractionmotors =

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| transmission =

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| multipleworking =

| trainheating =

| locobrakes =

| dynamicpeakeffort=

| locobrakeforce =

| trainbrakes =

| reservoircap =

| compressorcap =

| exhaustercap =

| coupling =

| maxspeed = {{cvt|80|kph}}

| poweroutput = {{cvt|605|kW}}

| poweroutput start=

| poweroutput 1 hr=

| poweroutput cont=

| tractiveeffort = {{cvt|167|kN}}

| t/e starting =

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| safety =

| operator = SNCF

| operatorclass =

| powerclass =

| numinclass = 580

| fleetnumbers = 63501–64080

| officialname =

| nicknames = 2 CV du rail

| axleloadclass =

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}}

The SNCF Class BB 63500 are a class of centre cab diesel locomotives built for SNCF between 1956 and 1971 by Brissonneau & Lotz. They are a slightly more powerful version of the BB 63400. A total of 580 locomotives were built. Four units, numbers BB 63896, BB 63901, BB 63902 and BB 63906, were equipped with electric train heating and based at {{ill|Dépôt de La Plaine|fr|lt=La Plaine}} for operating trip workings of passenger trains between Paris Gare du Nord and Paris Gare de Lyon round the Petit Ceinture. Three batches, numbered BB 63721–BB 63750, BB 63811–BB 63855 and BB 63981–BB 64020, totalling 115 locomotives, were equipped for multiple working.{{cite book |last1=Garvin |first1=Brian |last2=Fox |first2=Peter |last3=Appleby |first3=Chris |title=SNCF/French National Railways |date=1986 |publisher=Platform Five |location=Sheffield |isbn=0-906579-62-7 |page=38}}