The railroads, and thus the diesel manufacturers, had an interest in
considering a group of diesels to be a single locomotive because of the
labour issues.
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Still applies today. The rule book defines a locomotive as one or more
locomotives, coupled together and operated in multiple from the lead cab, or
something like that.
Cheers.
Roger T.
See the GER at: -
http://www.islandnet.com/~rogertra/