Old tracks and new trains

Hi everyone, I have looked into this Reddit but I’m am still not sure about the awnser. My boyfriend parents kept his old Lego train and tracks from when he was a child in the 90’s. I think it are the 9v ones. We want to gift our son the “new” passengers train but now sure will it be compatible. I have read that it can mailfuntion and even can burn up. Can someone help me? submitted by /u/VRC_Rhee [link] [comments]