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Union Switch and Signal Co, Plate A Section:

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photo courtesy of Zachary Gillihan Union Switch and Signal Company
Section A, Interlocking Machines
Plates A-100 to A-193
Saxby & Farmer,
Style "A," Stevens, Dwarf,
Table and Wall
Machines		 photo courtesy of Zachary Gillihan Union Switch and Signal Company
Section A, Interlocking Machines
Plates A-1000 to A-1075
Style "S-8" Electro-Mechanical
Interlocking Machines