In article , Dominic
writes
You're right - I think these units with a central non-driving motor
car started with the 4-CIGs and includes classes 313, 455 and 319.

Class 313 is two driving motors with shoes, separated by a pantograph
trailer.

The only other classes I know off by heart are those on my local line:
- 317 is two driving trailers separated by a pantograph motor and a
trailer, both non-driving;
- 365 is two driving motors separated by two non-driving trailers, one
with a pantograph. [They don't carry shoes round here.]

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