I think TTX Econo is included in TS2010 because it is used in sessions for both the "Port Ogden & Northern" and "Harbormaster" routes. TTX Husky Stack 53 was also included with TS2010, but isn't used in any built-in routes. Both are also on the DLS. (Search for Iceman2117 to find them and don't do a category search since at least one got miscategorized as a locomotive somehow.) Think I'll have to get his A/B/C TTX Econo set when my DLS access is fixed.
Sorry about that Russ, I seem to remember the TTX double stack wagons included in a version of trainz, but just couldn't remember which one, me being from the UK, we don't use these here, as it frightens the health and safety do gooders. They'll come up with, oh you can't do that, much too dangerous, the thing will tip and cause a derail-ment, where will we get our apples and spuds if that happens...