I have just been looking on ebay g gauge, there is a Bachmann Tramcar offered, what really struck me is the road it is running on, you cannot see much of the track, there seems to be a groove on the inside of the track for wheel flanges to run in, does anybody have any idea how this is done, I would like to build a roadway like this for my Tram, i would be gratefull for any ideas, Thanks in advance, Pete.