US&S 324363 11-pin Relay Matching Mounting Socket & Installation Hardware (Everything needed to securely mount the unit).
Vintage Railroad 1938 Union Switch & Signal Company Calendar Notepad
VINTAGE UNION SWITCH & SIGNAL CAST IRON RAILROAD LIGHT YELLOW BULLET LENS
Vintage Union Switch and Signal Company Model 12 D.C. Polarized Relay
Vintage Union Switch & Signal- Style KP Magnetic Stick D.C. Railroad Relay
Vintage Union Switch & Signal Velac Filament Supply Panel - 1950s Railroad
Vintage 1929 CHARTS of the PNEUMATIC EQUIPMENT of the UNION SWITCH & SIGNAL CO.
