Densha de go? Wow, I never thought I'd see a post about that game on this board...
You are going to have to look overseas if you hope to find anything from these games. If there were any of these imported into the US, I would be very surprised. It is, after all, a train conductor simulation based off Japan's railway system. Not too much relevance here.
I would suggest trying places such as Highway Entertainment or Coinop Express for pcbs. However, System 16 is showing that they are not JAMMA.