150s can go 30mph faster than 142s on the same track
I recently discovered that a 20mph speed limit between Northwich and Greenbank in Cheshire is only in place because Pacer 142s only run on two axles so cannot safely go over 20mph over a long viaduct. However, if Pacers were banned from the line then the speed limit could be raised to 50mph.
Apparently there can't be one speed limit for one type of train and another for a different type.
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