The Region consisted principally of ex-Great Western Railway lines, minus certain lines west of Birmingham, which were transferred to the London Midland Region in 1963 and with the addition of all former Southern Railway routes west of Exeter, which were subsequently rationalised.
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The fleet was originally numbered PWM650-654 in the Western Region Permanent Way Machines series, but were renumbered into the Class 97 series between 1979-1981.
The original Mk3 coaches delivered as part of HST sets for Western Region (Class 253) contained Trailer First (TF), Trailer Second (TS), and Trailer Buffet Second (TRSB) variants in formation TF-TF-TRUK-TS-TRSB-TS-TS.