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Last additions - Chicago Rapid Transit Company
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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. Interlocking106 viewsDec 25, 2011
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 Rear of relay rack in Relay Room, 13th St. Interlocking77 viewsDec 25, 2011
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 Relay Room at 13th St. Interlocking, showing plug-in relays, RPQ rectifiers, and ground detector apparatus76 viewsDec 25, 2011
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 Power panel in Compressor Room, 13th St. Interlocking71 viewsDec 25, 2011
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 Power panel in Compressor Room, 13th St. Interlocking77 viewsDec 25, 2011
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 Compressors at 13th St. Interlocking, Chicago Subway, C.R.T.73 viewsDec 25, 2011
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 Compressors at 13th St. Interlocking, Chicago Subway, C.R.T.71 viewsDec 25, 2011
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 Compressors at 13th St. Interlocking, Chicago Subway, C.R.T.71 viewsDec 25, 2011
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 Compressors at 13th St. Interlocking, Chicago Subway, C.R.T.76 viewsDec 25, 2011
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 Signal location A-48 near South Portal, Chicago Subway - C.R.T.79 viewsDec 25, 2011
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 UR Interlocking machine with Towerman V.C.Lanier, South Portal or 18th St. Interlocking87 viewsDec 25, 2011
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 UR Interlocking machine with Towerman V.C.Lanier, South Portal or 18th St. Interlocking85 viewsDec 25, 2011
     
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