I have read in peoples testaments of running their locos for around 30 minutes, and I got to think whether they could go longer on one steaming. Try 45 minutes!! Here's how:
Firstly I will describe my layout. It is a double track main line with R4 outside and R3 inside settrack curves set in a shed 6x3 metres. The outside track length is 15.412 metres long.
So the 'how' is easy. Isolate part of the circuit from electrical power. I have two sections of isolation, one being the access bridge to the room, 914mm and the other is between sets of points which is 3.27 metres long.
The train was Mallard with 8 Backmann MK1 Blood and Custards all with metal wheels and to minimise rolling friction I lubricated each axle.
I firstly ran Mallard for a few laps to warm her up, then after cooling for a while…
Another method to reduce heater power and extend running time is described here:
https://www.oolivesteam.com/group/technical/discussion/b93dba6b-c83e-4a75-82db-46b4295e45d7