(...) Union rules. Back when, anything with a number was a loco. Since a B unit had no number, it was not a loco, hence not needing a crew... That's why you see 300F, 300A, 300 B, 300C for example on a ABBA arrangement of F units (IIRC, that was (...) (22 years ago, 26-Feb-02, to lugnet.trains)
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