Galvanic corrosion

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This coal hopper, seen in Butler, Wis., has a main body built from aluminum and a center sill made of steel. Freight-car makers use non-conductive materials to separate the metals and prevent galvanic corrosion. Steve Sweeney Q There are aluminum-body Talgos and aluminum-body coal cars, both with steel center sills. High school chemistry teaches that […]

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Locomotive gear ratios

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Electric and diesel locomotives’ top speeds are governed by gear ratios and safe operations, like this Union Pacific westbound near Franklin Grove, Ill. Brian Schmidt Q What determines the theoretical top speed of a diesel locomotive? Is it the gear ratio? What other factors enter in? – Mike Pedersen, North Berwick, Maine A The maximum […]

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Steam whistles

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From the beginning of U.S. railroading, each railroad chose its own whistles that varied from high to low in pitch. Alex Mayes Q Have American steam engines always used a low-pitched or bass whistle, instead of a high-pitched whistle? – James Kelty, San Anselmo, Calif. A Steam whistles chosen by American railroads were almost always […]

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Whistles for helper engines

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On West Virginia’s Cass Scenic Railroad, engine crews with three Shay locomotives signal each other with whistles for moves and stops. Steve Sweeney Q In the days of steam, when railroaders didn’t have radios or other one-to-one communication, how did the engineer on the lead locomotive communicate to the engineers in the “helper” locomotives as […]

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NS ‘barcode’ unit

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SD70ACe No. 1111 Randy Olson Q I recently saw a Norfolk Southern locomotive passing through Vermillion, Ohio, with only four vertical stripes on the cab where a unit number should be. Can you explain what this designation is? — Joseph McCormick, Oberlin, Ohio A The stripes are really four “1s” for NS’s SD70ACe No. 1111. […]

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Original uses of GP60Ms

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On June 16, 1990, Santa Fe Railway GP60M No. 114 leads a westbound intermodal train near Ethel, Mo. These locomotives were originally purchased for intermodal service and have since been transitioned by the railroad to switching duties. Tom Danneman Q I’m a fan of BNSF Railway and have seen their ex-Santa Fe GP60Ms used in […]

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