I was thinking about trains that don't often operate services or run on routes that permit their designed top speed. The most obvious one I can think of are the 43's and 222 on the MML. Both of which capable of 125mph but don't normally exceed 110mph. A pacer/150 could be on the Valleys in Wales for days on end, do they get to 75mph at all?
Any more thoughts welcome.
Any more thoughts welcome.