Quote:
Originally Posted by klordger1900
You cant expect to get top end speed out of such old locos - it just aint safe!!
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Any loco on Network Rail must be deemed safe to run at there max speed.
Most heritage traction can run at there max speed. The class 31's used on Network Rail test trains are 50 year old and regular run at 90mph. Some owners may make restrictions to avoid damage to loco's. Class 50's were prone to generator flash overs when under load, so even in BR days at the end of class 50's speed restrictions were imposed.
Rule book speed restrictions apply for light loco, short formation trains and trains with 2 or more locos and therefore it may seem at times that the heritage loco is restricted.