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Most viewed - E.P. Interlocking
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 Hanna Coal Co. - Georgetown plant - E.P. Interlocking124 views
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 Bay on first floor showing relay racks and relays - Tower "A"124 views
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 Tower "A" and part of track layout looking north from draw span - Boston terminal123 views
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 Cable entrance from tower to duct line122 views
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 Track model, machine, and train starting indicator during construction121 views
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 E.P. Interlocking machine in Tower H120 views
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 Birds eye view from terminal layout from right hand side of terminal120 views
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 Birds eye view from left hand side of terminal120 views
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 Looking towards station, draws being raised - Boston terminal119 views
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 Birds eye view of terminal layout from left hand side119 views
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 Left hand side and end of relay house, station platform119 views
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 E.P Interlocking - West Ashland, KY118 views
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 Right hand and rear view of relay house on end of station platform118 views
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 E.P Interlocking - Stewart117 views
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 A-5 Single Switch Layout in south throat115 views
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 A-1 E.P S&L Moement - West Ashland, KY114 views
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 A-5 Switch114 views
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 Model 14 Interlocking Machine - North Approach - Chicago Union Station112 views
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 Battery room, rectifiers - first floor of tower "A"112 views
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 Left hand side of steel relay house over duct line112 views
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 Control room with machine and track model from North End111 views
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 Suburban trains leaving terminal, relay house at end of platform in foreground111 views
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 Right hand side of steel relay house over duct line111 views
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 Part of North Throat109 views
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 Part of north throat during construction109 views
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 Tower "A" and draw bridges - searchlight signals in foreground109 views
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 North end platforms showing the control and instrument rooms above concourse108 views
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 Cincinnati Union Terminal108 views
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 Relay racks and relays on first floor of tower "A"108 views
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 Model 14 Interlocking Machine - North Approach - Chicago Union Station107 views
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 Air view of Cincinatti Terminal107 views
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 Cincinnati E.P. Machine106 views
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