If they had survived to be reclassified,
Class 25 2-4-0 DIIK (Darned if I know) but maybe ?4
Class 35 2-6-0 MHB (may have become) a G6
Class 37 4-4-0 DIIK but maybe A5 (for American)
Class 38 4-4-0 DIIK but maybe A6
Class 39 0-6-0T MHB a S6
Class 40 2-6-0 MHB a G7
Class 42 4-4-0 DIIK but maybe A6 or A7
Class 42 1/2 4-4-0 DIIK but maybe A6 or A7
Class 45 2-6-0 MHB a G10
Class 45 1/2 4-6-0 MHB a T11
Class 48 0-6-0T MHB a S10
Class 56 2-8-0 MHB a C13
no class 0-4-4-0 MHB an L??
Fun to play with.
Doug vV