Isn't leap-slip going to naturally be a lot worse on a loco hauled service than with units? Far fewer driven axles. I can remember the locos having terrible problems years ago leaving Mullingar going down where the 22Ks have no bother whatsoever now. We often used to have to reverse towards Dublin to take a run at it and this could regularly add 20 or 30 minutes to the journey when there would be no problem at all going up.
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