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Maintainers and computer racks35 views
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Maintainers and computer racks34 views
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Automatic Switching Equipment51 views
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Automatic Switching Equipment with maintainer37 views
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Automatic Switching Machine39 views
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Cab, hump and trimmer signal controls on automatic switching machine38 views
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Cab signal in hump locomotive42 views
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Trimmer signal38 views
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Switch machine positioned ahead of each cut34 views
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Switch machine45 views
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Model 31 car retarder with HS-1 valves in foreground34 views
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HS-1 valve34 views
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Car weighing device38 views
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Car passing over car weighing device36 views
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Car wheel counter for track fullness34 views
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Car approaching car wheel counter35 views
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E. Conway Hump with W. Conway in background34 views
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NMEA Building and General Yardmasters office36 views
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NMEA Building and General Yardmasters office34 views
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Differential Pressure Unit41 views
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Differential Pressure Unit37 views
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Differential Pressure Unit35 views
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Auxiliary Exhaust Valve39 views
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Car speed is measured as each cut goes through master retarder39 views
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Cars are cut near top of crest36 views
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Car rollability on tangent track on car weight are measured near crest of hump35 views
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Car speed is measured as each cut goes through master retarder45 views
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Classification track from retarder control tower44 views
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Wheel counter and group retarder66 views
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Group retarders and classification tracks44 views
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Cars roll past yardmasters office into classification track44 views
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Operator at Retarder console51 views
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