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TDM certainly is used in push pull, but I am not sure whether it is the system used in HSTs - I think that TDM post-dates the HST. ON the old push pull sets used for Glasgow Edinburgh (with Class 27s - anyone remember?) the wiring was bespoke. Not sure how it is done these days - most use lead loco under power with the trailing loco providing other sources such as ETS or additional braking power...
Hope that helps
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