I bet it wouldn't surprise you that the concrete wall on the inbound side crumbled on top of a train last week, briefly shutting down service to Gladstone.
If you're referring to the ones where the locomotive is on the back of the train, it's because they're being operated by a cab car. In other words, the last car of the train holds a small booth at the very end, from which the engineer can control the train. It's much more convenient for passenger service than having to turn the locomotive around.
