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Last additions - UR Interlocking
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 UR Interlocking Machine, South Portal, Chicago Subway42 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway38 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway37 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway37 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway37 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway39 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway37 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway40 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway38 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway45 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway80 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago68 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago68 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago86 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago73 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago80 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street68 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street69 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street85 viewsDec 25, 2011
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 Transformer and terminal panels, North Portal Interlocking72 viewsDec 25, 2011
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 Rear of tranformer and terminal panel showing North Portal Interlocking75 viewsDec 25, 2011
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 Plug-in relays in relay room, North Portal Interlocking74 viewsDec 25, 2011
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 UR interlocking machine with 1st trick towerman, W.K.Wallace, North Portal79 viewsDec 25, 2011
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 UR interlocking machine, North Porta - Chicago Subway & Elevated - C.R.T.73 viewsDec 25, 2011
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 Looking north from Jackson on Continuous Platform, showing signal location A-9374 viewsDec 25, 2011
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 Relays, transformers, and RPQ-41 rectifiers in signal room AB94 on continuous platform near Jackson.72 viewsDec 25, 2011
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 G.E. Transformers, power panel, RPQ-41 Rectifiers and Relay panel in signal room AB-94 on continuous platform near Jackson.71 viewsDec 25, 2011
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 Southbound train at signal location A-18 and B-18, 13th St. Interlocking69 viewsDec 25, 2011
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 Southbound train at signal location A-18 and B-18, 13th St. Interlocking74 viewsDec 25, 2011
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 Motorman (Charles R. Blade) operating tripper release at signal location A-18 and B-18, 13th St. Interlocking67 viewsDec 25, 2011
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 Motorman (Charles R. Blade) operating tripper release at signal location A-18 and B-18, 13th St. Interlocking78 viewsDec 25, 2011
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 Rear of relay rack in Relay Room, 13th St. Interlocking69 viewsDec 25, 2011
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