That makes the sighting of a train arriving in Temuco from Santiago akin to bird watching. You might see one or not. But it is not like you can (or could) count on the swallows returning to San Juan Capistrano.
So if you need to make the trek from Santiago to Temuco by a certain date/time, don't count on the train.
Didn't they buy some trains (locomotives) from Spain a while back? Why didn't they get some from someone else? I didn't think Spain was one of the top builders of locomotives, but I could be wrong.
Isn't there a gauge issue between commuter and cargo trains in some (or many) parts of the world?