Zoomed-in views of the two towns:
Coal for steam engines is only available in the engine terminal. But water (which steamers use more quickly) is also available in the two towns, situated for passenger trains (running the inside route) to stop at a station and also position the tender at a water tower for a quick top-off.
I have positioned one water tower for the outside route, near the turnout serving the mine. If a train needs to stop here for water, a following train can use the cross-overs as previously described to work around.
