@bob2 even brass is susceptible to corrosion if it's exposed to ammonia fumes. I'm not interested in starting a museum; if it lasts another 40-50 yrs I won't be around to worry about it. But with the high prices of our trains, I feel strongly that there should be a handy reference list of affected modern-era trains, built from this community's knowledge.
Maybe Scott, Lionel, etc., should use plastic (horrors!) After all, K-cups will exist in landfills for thousands of years 
