Although a stretch but in addition to the narrow-gauge railway, then potentially as DLC the Arlesdale and Culdee Fell railways.
theyve collaborated with the Tallylyn railway to scan the map, a Tallylyn railway dlc for TSW and recolour the engines for Wonders Of Sodor would be a good way for DTG to recycle assets and make bigger profits
That would be a very smart way to double dip, they could finish the lower detail loco models and pump out the WoS release quicker, using its simplified controls, to start bringing in money from it, while then having another team put in more development time on realistic physics and detailing for a TSW Tallylyn release. Definitely would make for a financially sound business plan.
I believe you misunderstood the previous post - DTG collaborated with them in order to get the WoS Sodor map. Because they could not use real world topography for the height maps as they would for most TSW routes, due to it being fictional, DTG instead ensured its accuracy by visiting them and making a 3D scan of the original three dimensional Sodor map displayed on the wall of the recreation of Awdry's study at their museum.