Those Thomas switchers and Consolidations are not as rare as one might think. They also made tank car kits, and not sure, but I think a line of open platform passenger cars. All the dies were apparently lost in a fire.
The tank cars can be built into nice models with a bit of reinforcement inside the .010 brass tank wrapper.
I am not a big fan of Thomas, but some day I might have to have a B&O C-16 saddle tank in 17/64 scale. I really do have a Mantua Shifter in 17/64, as well as a Bowser K11 in 1/4" scale.