Sodor Workshops
Railway Works 3D
CogsRailway3D
Marvelous Mainland Works 3D
These are the four main websites that carry TTTE content and at least one of them has a Knapford Station Route. People on the Trainz forums don't really deal in Thomas content and instead prefer to focus on the actual prototypes of locomotives. Each website has its own discord channel too so I would recommend asking there from now on.
Hope it helps! Cheers!