Here is my 1" scale 2-4-4-2 Skookum style loco on the St Croix Highline on July 3, 2024. Copper boiler, propane fired, you can hear the burner roar. This one requires a fine balance between draft, throttle position, and fuel pressure to maintain proper boiler pressure. It took me a couple of laps to get it right. Having 4 cylinders it has a healthy appetite for steam, but a very fun locomotive to operate.