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S.B. passenger passing remote control T.O. signals at Trimble - Big Four52 views
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Train approaching Boonville Bridge - M. K. T.52 views
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Burlington freight at Birmingham, Mo. interlocking52 views
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Westbound Burlington freight at Graham Jct. remotely controlled from receiving yard interlocking, Galesburg52 views
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M-4 Switch Machine (Open)52 views
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52 views
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C.T.C. Installation, Red Oak to Balfour - C.B.& Q.RR52 views
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U-6 Switch Circuit Control52 views
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U-7 Switch Circuit Control52 views
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U-10 Switch Circuit Controller52 views
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Spring Switch installation, Wabash R.R.52 views
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Spring Switch installation, Wabash R.R.52 views
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Spring Switch installation, Wabash R.R.52 views
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Wabash high speed movement over mechanically locked spring switch, Birmingham, Mo.52 views
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S-1 Mech. Facing Point lock at Potts Grove, Readng System52 views
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Spring switch installation on the C.M.St.P. & P.52 views
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Spring switch installation at Ferguson, Ia. on the C.M.St.P. & P.52 views
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SL-26 Electric Switch Lock as applied to T-20 Switch Stand52 views
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TVL Radio Equipment Special for American Bridge Co. to U.S. Steel52 views
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TVL Transmitter (Otis Elevator Co.) (Front)52 views
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TVL Transmitter (Otis Elevator Co.) (Back)52 views
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Style 202 Heavy Duty Relay (Atlas Elevator Co.)52 views
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TVL Battery Charger Weatherproof (Atlas Elevator Co.)52 views
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Union Telecrane Dolly Display (with cover off)52 views
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Miniature Relay Socket Type C52 views
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Miniature Relay Style PL52 views
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Miniature Relay Style D52 views
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Miniature Relay Style E52 views
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Steel Mill Carrier Control - Selector Switch52 views
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Steel Mill Carrier Control - Power Supply52 views
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Hazeltine Radar Display Unit (US&S Indicators)52 views
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Field Cabinet - Arabian American Oil Co.52 views
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