Which reminds me of something I thought about recently: regardless of era or type, preservation isn't just about the actual locomotive, coach or wagon, it's also about preserving the knowledge, the skills and the facilities to fabricate the various parts, from castings for engine blocks, con rods or wheels, to wiring for alternators, windings for traction motors, mouldings for plastic parts, etc. Unless 'we' as a preservation movement attend to these things, then preserving any vehicle in running order is ultimately a fruitless task.