Southern's cross-London operation between East Croydon and Milton Keynes requires dual voltage EMUs. Two versions of the class 377 "Electrostars" operate the route - 4-car 377/2s (15 built) with a batch of 8 5-car 377/7s which is see here. Set 377705 is seen on a northbound working at Watford Junction on 20 September 2017 - 2M31, 12:10 East Croydon to Milton Keynes Central.
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