I had this issue (longer steam engines clipping the tunnel entrances with their cab roofs) for my Century Club 773 and my Legacy K4. But after I began to run something "scale"- this became a problem.
I was not willing to tear out and replace my tunnel entrances. IF I had anticipated ever buying these larger locos, I would have made allowances while building the layout. I might have not done it to a 1950 773, but for the later ones each case, I had to clip the aft cab corners to get clearance.
Yeah, I know- heresy!! Let's face it fellow O Gauge enthusiasts- an engine built in 2000 - after the same one built in 1953 and 1964- is not as much "collectible" any more, once they are run, and run pretty often. I don't expect to last another 40 years so that a CC 773 appreciates in value from the $800 I paid to what?? $ 1000?? $ 1200?? So I don't see a lot of collector value left. Run 'em!!
So far no visitor has even noticed the slightly angled back corners of the cabs.
