YES! That Tichy set is what I'm looking for. The lettering changed very little from the 20s to the 70s, so it should work very nicely. Thank you!
The CDS set is the one I wanted, but having bought some "new" sets from Ozark Miniatures in 2019, and having about half of them unusable, I hesitate to buy more. Apparently TMR feels the same way, because they specifically warn that these are 20 to 40 years old, and may not be any good! But Tichy's will work just as well, and on a round car, will probably be easier. Dry transfers can be hard to get straight on things that don't want to sit still.
The Microscale set does have Roman lettering, but it's a wider font, more appropriate for later cars, and doesn't have the "UNION TANK LINE" name to go above the reporting marks. I have that set, and have used many of the other reporting marks from it.