I also vote for the re-issues, Shay/ Climax/ 2-8-0/ Porters/ Davenport, and a new Prairie. But a 0-6-0 Tank could easily be based on the 2-6-0, or even better make it a large 2-6-2T. Just the tank and cab would need to be new, reusing everything else and adding a trailing truck.
And I was hoping I wouldn't have to disturb the gear towers.
Also was there any thoughts on a previous thread about simple modifications to the venerable Big Hauler passenger cars to function as interurbans? i.e. Single end molding for a front/rear, end caps for the roof to cover the end moldings, and a simple universal side frame for a block based on the current truck with representations of a few truck type, a Brill-like, Standard-like and Baldwin-like side frames. With these simple modifications, a host of trolley/interurbans could be build, freight motor (full baggage), combine (same), full passenger (coach), Parlor (Observation). Kitbashers could splice the cars together for longer cars, different window combinations etc. Maybe an insert with an arched window instead of the square sashes. You could also sell the parts to retrofit existing cars: new floor, ends, and roof; powered or unpowered truck sets...