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| Class 121 Pressed Steel Single/2-car sets |
| Introduced : 1960 | Coupling Code : Blue Square |
| Engines : BUT (AEC) 150hp | Body : 64ft 1/2 in x 9ft 3in |
| Transmission : Standard mechanical |
Following the success of the Gloucester Singles, the Western Region ordered a further batch of single units this time built by Pressed Steel Co. Ltd.
