Description
Each Class 315 unit is formed of four vehicles, some vehicles are attached to another set of four vehicles to make 8 vehicles and some maybe attached to another four to make 12 vehicles on long distant journeys, such as ones to Southend Victoria or Southminster (Greater Anglia). The vehicles include: Driving Motor Standard Open (DMSO), Pantograph Trailer Standard Open (PTSO), Trailer Standard Open (TSO), and Driving Motor Standard Open (DMSO). Each DMSO carries four traction motors (315801-841 originally had Brush TM61-53 and 315842-861 had GEC G310AZ but these motors are interchangeable and nowadays any type can be found on any unit) rated at 110hp each and a main compressor and air reservoir which carries air for the brakes and suspension. The door system which was pneumatic has been replaced by an all electric door system. The PTSO carries the main and auxillery transformers, batteries and battery charger, Stone Faiveley AMBR Mk.1 pantograph, vacuum circuit breaker and auxiliary compressor. The TSO carries no equipment other than that which is standard to all coaches.
The coaches only contain standard seating and have no toilet facilities. Car numbering is as follows:
- 64461-64582 - DMSO
- 71281-71341 - PTSO
- 71389-71449 - TSO
Each 4-car set is able to seat 318 passengers.
A refurbishment programme commenced from mid 2004, when National Express East Anglia (then 'one' Railway) contracted Bombardier to carry out the refurbishment of all 61 units, starting with the ex-First Great Eastern examples. The low-back 3+2 seating is retained, so the capacity stays the same.
The Class 315 units replaced the life-expired Class 306 units. Greater Anglia are refurbishing a third of their trains and so this might mean they aren't going to replace them whilst they are still in charge of them.
Read more about this topic: British Rail Class 315
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