When the Provo-Denver departed Provo, it was on Main 2. When the train got to Springville, DS-378 crossed the train over to Main 1. Main 1 and Main 2 do not follow the same alignment through Spanish Fork, but come back together at the throat of the canyon that leads to Soldier Summit. Here, in some of the last bit of light for the day, the Provo-Denver on Main 1 meets back up at Main 2 in Spanish Fork for the journey east over Soldier Summit.
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