I have used the ERR TMCC / RS to upgrade many of my PS1 steam and diesel locomotives. Also, some K Line steam that is scale, very detailed and runs great with the upgrades added. Also used the ERR CCM to correct/upgrade my K Line St Fe Berkshire when it failed. I have more MTH to upgrade, but waiting until I can do so and not relinquish the engine unique sounds they have, particularly the various turbines.
Jesse TCA 12-68275