Obviously this is a Cab Forward, AC12 articulated Legacy Locomotive. Notice the drivers as it goes by. The 2 different engines are OUT of SYNC. I made that change, it was a 5 minute job. Also note that the sound did NOT change at all whether they were in sync or out of sync. It's articulated, and has articulated sounds. Kind of hard to hear it being doubled headed with the GS4, BUT notice the AC12 is making twice as much sound as the GS4 as they go by
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