Distorted and crackly towerman's announcements may be a good idea. Like those you may hear at a train yard. But these announcements shouldn't be too often or too loud or they could disrupt the musical theme (better if they are triggered to fit in queter moments when music loops).
Also I always wondered why Abe rides in the locomotive's cab where a slig engeneer crew should be. Obviously he has no skills to run a freight train.
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