Quote:
Originally Posted by Gordon
I'm aware of the 75mph restriction for main-line steam, but does any such blanket limit exist for heritage diesel traction, or is each class judged on its own?
What I'm getting at, is that is there any reason why no-one's running Deltics at over 100mph on the ECML for our enjoyment 
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Just before I retired in 2006,the speed limit for "heritage" traction depended on the loco class,for instance a class 50 was limited to 75mph under power but 90mph coasting,that was for 50031 & 50149,whether it applied to all 50's I can't say.If I remember right 46072 was limited to 75 mph.