Production Classes
The production-run classes which are most visibly similar to the PEP Stock are the dual voltage 750V DC/25kV AC Class 313, the 25kV AC Classes 314 and 315, and the 750V DC Classes 507 and 508. However, subsequent builds have also drawn heavily on the experience gained by this stock.
The PEP units had three sets of sliding doors on each of the non-driving cars for handling dense inner-suburban traffic. However, the Class 313 and all subsequent builds, including later Mark 3-based units, have only had two sets of doors per car.
Read more about this topic: British Rail Classes 445 And 446
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