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Last additions - UR Interlocking
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 UR Interlocking Machine, South Portal, Chicago Subway51 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway48 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway46 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 Subway45 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway47 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway47 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway51 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway46 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway54 viewsDec 25, 2011
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 UR Interlocking Machine, North Portal, Chicago Subway87 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago77 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago78 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago96 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago82 viewsDec 25, 2011
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 UR Interlocking Machine, State St. Subway, Chicago89 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street76 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street78 viewsDec 25, 2011
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 Chicago Subway Interlocking machine - Dearborn Street94 viewsDec 25, 2011
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 Transformer and terminal panels, North Portal Interlocking81 viewsDec 25, 2011
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 Rear of tranformer and terminal panel showing North Portal Interlocking82 viewsDec 25, 2011
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 Plug-in relays in relay room, North Portal Interlocking82 viewsDec 25, 2011
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 UR interlocking machine with 1st trick towerman, W.K.Wallace, North Portal87 viewsDec 25, 2011
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 UR interlocking machine, North Porta - Chicago Subway & Elevated - C.R.T.82 viewsDec 25, 2011
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 Looking north from Jackson on Continuous Platform, showing signal location A-9383 viewsDec 25, 2011
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 Relays, transformers, and RPQ-41 rectifiers in signal room AB94 on continuous platform near Jackson.81 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.81 viewsDec 25, 2011
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 Southbound train at signal location A-18 and B-18, 13th St. Interlocking78 viewsDec 25, 2011
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 Southbound train at signal location A-18 and B-18, 13th St. Interlocking82 viewsDec 25, 2011
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 Motorman (Charles R. Blade) operating tripper release 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. Interlocking85 viewsDec 25, 2011
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 Rear of relay rack in Relay Room, 13th St. Interlocking75 viewsDec 25, 2011
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