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    UKP: BR Multiple Unit 121

    Diesel Unit

    Class 121 Pressed Steel Bubble Car

    The British Rail Class 121 is a single-car double-ended diesel multiple unit. 16 driving motor vehicles were built from 1960, numbered 55020–55035. These were supplemented by ten single-ended trailer vehicles, numbered 56280–56289 (later renumbered 54280–54289). They have a top speed of 70 mph, with slam-doors, and vacuum brakes. The driving motor vehicles were nicknamed "Bubble Cars" by some enthusiasts (a nickname endorsed and made official by final passenger service operator Chiltern Railways).

    The Class 121 is Britain's longest serving DMU, operating in passenger service for 57 years until 2017.

    14 vehicles have been preserved

    Builder Pressed Steel
    Introduced 1960
    Engine Leyland
    Length 19.66m
    Width 2.82m
    Height 3.77m
    Withdrawn 2017
    Transmission Mechanical
    Max Speed 70mph
    Wheelbase 14.17m

    Photo: Dan Cardwell

    Number Altnumber Name Status Formation Note Livery Depot Location Base Owner In Service Withdrawn Scrapped
    121020 97772255020960002L120 P 55020 DMBS CRB PR Bodmin & Wenford Railway PRE Sep-60 UK/121 UK70/121
    121022 97787355022960014L122 P DMBS NSE PR Locomotive Services, Crewe BR Nov-60 UK70/121
    121023 L12355023 P DMBS GRN PR Chinnor & Princes Risborough Railway PRE Nov-60 UK70/121
    121024 97785855024960010L124 R DMBS MAR PR Chinnor & Princes Risborough Railway PRE Nov-60 UK70/121
    121025 977859960011L125 Pandora S 55025 DMBS RT TM Honeybourne Airfield Industrial Estate DPR Nov-60 UK/Dept UK70/121
    121026 B126P12697782455026 X DMBS Ammanford Metal Recycling 2009 UK70/121
    121029 97796855029 R DMBS NRL PR Rushden Transport Museum PRE Dec-60 UK70/121
    121031 97797696030355031 S DMBS Ex Severn Tunnel Rescue Train NRL PR Ecclesbourne Valley Railway PRE Dec-60 UK70/121
    121032 C132T13255032977842 Cardiff Queen Street/Cardiff Bay** A DMBS GRN PR Wensleydale Railway Dec-60 Mar-12 UK70/121
    121033 97782655033 A DMBS GRN PR Colne Valley Railway PSH Dec-60 27/05/95 UK70/121
    121034 97782855034W55034 A DMBS now back on mainline service as route learner GRN CL Ecclesbourne Valley Railway LSL Jan-61 UK/121 UK70/121
    56285 54285977486L285960006 X DTS Northampton Ironstone Railway Feb-61 Oct-09 UK70/121
    56287 54287L287L211 A DTS GRN PR Epping & Ongar Railway EOR Feb-61 10/04/92 UK70/121
    960302 977975121027L12755027 R DMBS Ex Severn Tunnel Rescue Train UUU PR Ecclesbourne Valley Railway WYV UK70/121
    W55028 97786096001212102855028 John Cameron** A DMBS GRN PR Swanage Railway PRE Dec-60 UK70/121
    W56289 54289L289 O DTS BRB BQ Buckley Wells East Lancashire Railway PRE Feb-61 04/12/92 UK70/121