I was under the impression that Wolverine Service trains ran with either an engine or NPCU on each end, however yesterday I saw 350 at Royal Oak with IDTX 4624 leading and nothing on the rear. We went up to Pontiac and watched them take IDTX 4615 (Facing west) and put on the rear to lead back to Chicago and then take 4624 off and parked on the station track at the north end of the platform. Is this standard or something one off?
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