Well I saw what I belive to be a WCR Class 37 pass through Warrington BAnk Quay last week and it was doing I would say in excess of 75mph.
I would Imagine that Hertiage Locos maximum speed allowed can depend upon wether or not it is carrying passengers or not.
There is also the paths to consider on which route it is taking as rember Tornado on Top Gear was only allowed to do 75mph for pathing reasons Iam led to belive.
I know tornado is steam loco but I was using it as an example...
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