- Reliability. And reliability trumps all else. What good are "cool" features when the train won't respond? TMCC works and its small number of issues have proven solutions, unlike DCS with its 5 TIU hardware versions, countless software revisions, book of spells and incantations, and thousands of "Engine not found" posts. The numbers don't lie. Any objective comparison of problems between systems over the past 15 years prove TMCC's reliability over DCS without any doubt whatsoever.
And George wins the Internet today! ("[B]ook of spells and incantations!" Hah! LOL, etc.)
I carry no candle for TMCC or Legacy--I have had my problems with both, more the engines themselves than the control system. I have no desire to install a system as complex, as touchy, and as high maintenance as DCS. I'm going in the other direction: back to conventional. Push the handle, the engine moves. Pull it back, the engine stops. Push a button, the whistle sounds. Darned hard to mess up and relatively easily fixed if you do.