by Allen Hazen
I've never seen any details on the 1970s study, but I was aware of its existence: the Columbia business school library subscribed to "Railway Age" and there was a brief report.
Possibly the same article as the one with a sketch of a conceptual "dual mode" SD-40: a unit that looked SD-40-ish and had an SD-40's diesel engine, but ALSO had a pantograph. I don't know whether that idea got to the stage of detailed plans or not.
Possibly the same article as the one with a sketch of a conceptual "dual mode" SD-40: a unit that looked SD-40-ish and had an SD-40's diesel engine, but ALSO had a pantograph. I don't know whether that idea got to the stage of detailed plans or not.