BR 253 253 041Doncaster Doncaster

Class 253 (and Class 254 and 255) are classifications that have in the past been applied to InterCity 125 high speed trains in Great Britain. When built, from 1976, the InterCity 125 rolling stock was considered to be diesel-electric multiple units, with semi-fixed formations of power cars and intermediate passenger trailer cars. They were all numbered in the 4xxxx carriage series set aside for HST and Advanced Passenger Train vehicles. Class 253 were Western Region 2+7 (two power cars and seven coaches) sets operating out of London Paddington
http://en.wikipedia.org/wiki/British_Rail_Classes_253,_254_and_255