The new dual voltage five-car 377/7 subset of the highly successful Electrostars are due to enter service with Southern later this year (2014). 377708 and 377707 pass through Northampton working the 10.33 Wembley to Rugby crew training run. Whilst in this scene they are working on 25kV AC they are also capable of working on the 650V DC used on the Southern network.
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