Interlocking: Vassar Tower, MI
Vassar Tower was the interlocked crossing of the NYC's Bay City Branch and the C&O's Saginaw to Port Huron (via Marlette) line. The tower was later automated and taken out of service. Now the crossing is controlled by a gate which is operated by train crews.
1925. The Vassar interlocking was rebuilt, adding 3 levers. [RSC-1926]