I just received one of these yesterday. I generally use Lionel 027 track but I have a loop of Fastrack under the Christmas tree. I set the shed on the Fastrack and the roadbed is too wide for the slot in the shed. A boxcar won’t roll through the shed without hitting the platform. Unless there is a non-obvious way to put them together I don’t believe the shed and Fastrack are compatible.
On the other hand, there is a YouTube video titled MTH Pennsylvania smoking dual engine shed that shows locomotives inside the dual shed version filling it with smoke. It looks like they’re using Fastrack but there’s no video of the anything passing into the shed.
