ToledoEd posted:Matt, you are so right....I learned the hard way.
So did we. We had a tunnel portal near a turnout. Over the years, the building/bench work shifted due to weather/temperature variations over the past several years and the portal (mounted against a building wall) shifted and we have to use 0-5-0 helper service to move Challenger and Big Boy boilers in about 1/8" when the go into that portal from the through yard. We're going to pull it out and shave it, then re-mount it with a Big Boy in place to verify the clearance.
We also have an issue in the staging yard where we keep the curve on track #3 clear if a Big Boy is running on the mainline (track #4) because at the time we built the staging yard, no one owned a scale Big Boy. It was easier to enact a procedural change than re-track the entire staging yard.
As they say, "Wisdom prevents you from making dumb mistakes, but wisdom comes from learning from your dumb mistakes," 
