But always within a couple of hours of taking out of the box, new. These are the failures I have had in the last, say, two years.
Lionel U30C#1 - 2 hours
Lionel U30C#2 -would not run when new - worked for quite some time, but it fixed itself - sat on a shelf for six months, now runs
MTH GP9 - about 20 minutes
MTH 241.A - about two hours (fixed)
MTH 999 - not even an hour, could not fix
MTH RTR 4-6-0 - very soon after starting to run, could not fix
Lionmaster Big Boy - runs sloppy and irratically after about 800-1000 hours of flawless performance - I think it's just worn out.
BTW - this is out of about 25-30 new locos. Keep in mind I that, counting the 241.A I fixed, I am 17 for 17 high-end (Premier or Legacy/Vision) locos - I had to repair one, but all seventeen run perfectly. (I know the 999 was technically a Premier loco from MTH but it cost me less than $500 and I never thought it was even close to being in that same category with the vision hudson and MTH 241.A).