CMStPnP
The Grapevine Steam Train just North of DFW Airport has thrived here in Dallas.
Which goes to what I said - with GST, they have a metroplex from which to draw passengers from. Most tourist lines run on abandoned lines, which were abandoned because there was no business (or people) on them.
Unless a tourist line has a significant drawing card (WM), they rely on folks willing to travel into the sticks for a train ride.