LMSR 4-6-2 locomotives - MikeMorant
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LMSR Stanier 'Princess Royal class pacific no. 6206 Princess Marie Louise is depicted here in charge of what appears to be a test train of some sort standing on the Down main opposite Carlisle's Kingmoor shed..
It's been suggested that this occasion was in conjunction with an increase in superheat.
[Mike Morant collection]