55029 (L129) & two thirds of Class 117 set L425 (59515 & 51405) accelerate away from Langley station on 6 November 1986 with the 2F43 14:34 Paddington to Reading Network SouthEast service. The practice of replacing a Class 117 DMBS vehicle with a bubble car was standard practice when required, and demonstrates the versatility of the blue square multiple working system.