The Class 170 is a Diesel Multiple Unit built by Bombardier between 1998 and 2005. A total of 122, two or three carriage units were built in this time.

 

The units have a top speed of 100mph, powered by their MTU 6R 183TD13H engines, found under the floor of each 23m long carriage. The units are very widespread across the United Kingdom, serving in many regions.

 

There were a total of nine units used by South West Trains. The fleet consisted of 170301-170308, and 170392. All of the units were two car, and were used mostly between London Waterloo and Salisbury, but it was not unheard of for the units to reach Exeter St Davids, or even Paignton.

 

The trains were later cascaded to First Transpennine Express and Southern, when South West Trains recieved some Class 158 units to supplement the Class 159 fleet.