Bulleid Q1 loco
loco body
The SR Q1 class is a type of austerity steam locomotive constructed during the Second World War. It was designed by Oliver Bulleid for use on the intensive freight turns experienced during wartime on the Southern Railway.
Could also be used for an 0-8-0 variation(fictional but plausible)
Requires chassis and finishing
TT120 (1/120 scale)
more info about Bulleid here
https://en.wikipedia.org/wiki/Oliver_Bulleid
and Leader loco
https://en.wikipedia.org/wiki/SR_Leader_class
more 3d printed models from Recreation21 here
https://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm