For parks that have existing steam trains, the equipment and expertise and importantly staff to run them - sure, as they are a quaint nod to the past and not something one can experience elsewhere. For parks that do not have it, establishing it in this modern time when the equipment, and the knowledge to operate them is slowly dying, it is not nonsense, just reality. If DW were operating a steam engine, and had all associated people and equipment in operation, but that loco was due for retirement, picking this engine up in the firesale would make perfect sense. But re-establishing a new engine after the park has retired it's steam capability in both equipment and staffing is simply ridiculous. And pointing to Vintage Cars as proof they can do it with trains is not comparing apples with apples. lawn mower engines and rolling chassis can be maintained by many mechanically minded blokes in their backyard and is an entirely different kettle of fish to a pressurised boiler. The landscaping is simply not a factor either as they already employ gardeners.