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locomotives working in multiple are down to the connectors linking each locomotive not the coupling of the trains.
so if a class 60 was attached to a class 66 they wouldn't be able to work in multiple, one of the locomotives would be "dead" or running idle if the engine was running.
Class 59's Class 66's and class 67's can work together in powering trains as they use a system called AAR or something like that its called.
But going back to speed restrictions. The class 66 differs from the class 59 in the sense that the wheels follow the curvature of the track as the end wheels of each boogie are self steering thus preventing rail wear so would be interesting to know if there is a difference for class 66 on speed restictions if it goes on wear and tear on some things.
Plus class 59's (not sure about the 59'2's tho) have some sort of computer control thing that controls the amount of wheel slip on the rail...allowing the wheels to slip by a certain amount on pulling away from a heavy start but the amount they are allowed to slip by is small.
but would be interesting to know if things like that affect speed restrictions on loco's.
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