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most of the time with 1st generation diesels the rear loco is hauled as an additional vehicle the driver, depending on type, has to isolate the DSD on the rear etc.... 'top and tailing' is done nowadays to save money on running round the train or maybe the train traverses a branch with no run round facilities.....TDM was/is used on the overhead electric hauled services and is a little different to remotely controlling a loco from another loco....
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