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Maintainers and computer racks34 views
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Maintainers and computer racks33 views
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Automatic Switching Equipment47 views
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Automatic Switching Equipment with maintainer36 views
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Automatic Switching Machine38 views
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Cab, hump and trimmer signal controls on automatic switching machine37 views
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Cab signal in hump locomotive41 views
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Trimmer signal37 views
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Switch machine positioned ahead of each cut32 views
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Switch machine42 views
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Model 31 car retarder with HS-1 valves in foreground32 views
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HS-1 valve31 views
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Car weighing device33 views
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Car passing over car weighing device33 views
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Car wheel counter for track fullness33 views
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Car approaching car wheel counter34 views
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E. Conway Hump with W. Conway in background31 views
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NMEA Building and General Yardmasters office35 views
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NMEA Building and General Yardmasters office32 views
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Differential Pressure Unit40 views
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Differential Pressure Unit35 views
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Differential Pressure Unit31 views
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Auxiliary Exhaust Valve38 views
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Car speed is measured as each cut goes through master retarder35 views
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Cars are cut near top of crest35 views
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Car rollability on tangent track on car weight are measured near crest of hump33 views
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Car speed is measured as each cut goes through master retarder43 views
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Classification track from retarder control tower43 views
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Wheel counter and group retarder62 views
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Group retarders and classification tracks42 views
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Cars roll past yardmasters office into classification track43 views
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Operator at Retarder console49 views
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