The ball signal is a B.E.S.T. (Bollinger Edgerly Scale Trains) model of the Whitefield Junction signal in New Hampshire. The signal is set to allow the narrow gauge to cross the Maine Central track. The shack is from Portland Locomotive Works and is based on a structure by Sam Swanson.
The final step on the crossing was installing the guard rails inside the diamond. Like the other guard rails on the narrow gauge track, it was made using plastic rail to avoid electrical shorts.
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