Ahh that makes sense - thank you! Just looked it up and turns out the LNER bought some ex-WD "Austerity" tanks. Every day's a school day!It is both an austerity tank and a J94 as they are the same loco Not to be confused with the WD 2-8-0 tender locomotive which was also an austerity. I think austerity is just a general term for a wartime locomotive built simply and cheaply.
-Peter