The Class 350 units differ from the Class 450 because the latter units operate from 750 V dc from a third rail, whilst the Class 350/1 units operate from both 25 kV ac from an overhead power supply, and also 750 V dc from a third-rail.
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so the class 350/1 units are basically the same with the 350 units right?
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Answer:
The Class 350 units differ from the Class 450 because the latter units operate from 750 V dc from a third rail, whilst the Class 350/1 units operate from both 25 kV ac from an overhead power supply, and also 750 V dc from a third-rail.