rrman posted:

Are the latest greatest TIUs have this mod, or does the owner have to send in TIU, or is there a rev number letter to denote the additional diodes?

When the first mod that came out on rev L that added small smd TVS the TIU got a silver dot on the back by the Rev L sticker.  Not sure what is being done now.  G

MTH Authorized Service Center

Authorized ERR Dealer

Lionel Independent Repair Tech

Virginia Train Collectors Member

I had the service bulletin preformed on my revision L TIU during warranty. The tiny TVS diodes were replaced with the larger ones per the service bulletin by MTH. 10 months later and so far so good. The worst derailments I've had have been a car wheel coming off the track through a switch and touching the center and outside rails, so nothing crazy. 

Santa Fe, All the Way

gunrunnerjohn posted:

Since the small TVS wasn't fixing anything, hopefully you don't have a silver dot!

It actually became part of production so if it was a newer model without silver dot, it still had those TVS.  G

MTH Authorized Service Center

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Lionel Independent Repair Tech

Virginia Train Collectors Member

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