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Hey I know in the steam days that communication between the train crews and helper crews was by the locomotive whistle and i assume this carried on into the early diesel era also. However nowdays do helper locomotives still have their own crews? Or are the helpers remotely connected to the lead units MU system? If so when did this start to become the norm? I assume that if it is done this way then either another crew needs to ride along so they can bring the light engines back down the mountain, or else they are attached to the next train heading down and detached again at the bottom of the hill. Is this the way it works?? Thanks!
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