Hello Thomas Knapp,
you can look on shapeways, there are a lot of road pieces, turntables, turnouts, curved tracks and many other.
There are items with code 75 and code 100 rails.
Also in other gauges, N, HO ect.
In Europ shapays is printing in Netherland, in USA manufacturing facilityes are in Long Island City,N.Y.
Kind regards
Gerhard
