Leaving Chama is all uphill until Cumbres Pass, elevation 10,015 feet; I think they said a 4% ruling grade. We could look ahead at the track in front of us and the gradient was easily perceived.
Then the rain started to fall. It wasn’t heavy, but enough to make the rails slick. The locomotive’s drivers slipped, and the train stalled. We backed down to a less steep segment of track and waited for the steam pressure to build again. For a while it was like 2 steps forward, 1 step back. There were some awful jerks as the slack would come out of the train. The engineer tried to keep it smooth, but I can only imagine how hard it was to release the brakes, throttle up, apply the sand, only to find the drivers slipping again. The sound of the rapid rush of the cylinders echoed off the next mountain on the other side of the river. The draft gear throughout the train got a workout that day.