Population 524, and once a great city overlooking a canyon, parts of the city long ago fell into the canyon.
The city is bisected by the canyon, and the only way to cross is over the rails.
Grand Canyon River and the Great Salt Lake
The Grand Canyon river once dug out a mighty canyon, and the train must cross it. But the river today is but a trickle that doesn’t even reach to the great lake. The lake itself is a shallow, briny mess.
Only the rails go over the canyon: the road has fallen into the river.