British Rail Class 325
Overview
 
The British Rail Class 325 is a 4 car dual-voltage 25 kV alternating current
Alternating current
In alternating current the movement of electric charge periodically reverses direction. In direct current , the flow of electric charge is only in one direction....

 (AC) or 750 V direct current
Direct current
Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through...

 (DC) electric multiple unit
Electric multiple unit
An electric multiple unit or EMU is a multiple unit train consisting of self-propelled carriages, using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages...

 (EMU) train
Train
A train is a connected series of vehicles for rail transport that move along a track to transport cargo or passengers from one place to another place. The track usually consists of two rails, but might also be a monorail or maglev guideway.Propulsion for the train is provided by a separate...

 used for postal train services. They are based on the Class 319. The Class 325 was British Rail's newest unit to take over parcels working on electrified lines.
The 16 units were built at ABB Derby between 1995 and 1996. They are very similar to Class 319
British Rail Class 319
The British Rail Class 319 dual-voltage electric multiple units were built by BREL York in two batches in 1987–88 and 1990. The trains were introduced for new north-south cross-London services from Bedford to Brighton, and since privatisation these services have been operated by Thameslink and...

 units, sharing the same traction equipment and body design, but are fitted with cabs of the same design as the ABB Networker
Networker (train)
The Networker is a family of trains which operate on the UK railway system. They were built in the late 1980s and early 1990s by BREL . The trains were built for the Network SouthEast sector of British Rail...

 family.

TOPS
TOPS
Total Operations Processing System, or TOPS, is a computer system for managing the locomotives and rolling stock owned by a rail system...

 numbers are on the front of the cabs under the driver's window in a non-standard font, and the units were numbered 325001 - 325016.
 
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