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Hey railwayman, thank you for explanation!You give a nice view train-perparing!  But in practical terms, only weighted train-load (and Factor of expirience, of course) plays a  role, then. From slow and heavy to light(er) and fast.Trainmaster: "Got 5430t of that PFE-Stuff"... Hostler: "Oh man, they   need a helper again, 'n today my day off!"...
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