Nate,
The SR&RL #24 is a 1:19th scale engine. In the UK there are lots of 2' gauge (and 60cm gauge) lines, like the SR&RL. The UK guys use gauge 0 track (32mm gauge) to represent 2', which is 16mm:ft or 1:19 scale. (SM32 is the same, the SM stands for Sixteen Millimeters.)
There is very little difference between 1:19 and 1:20.3, although it is wrongly gauged for our gauge-1 track at 45mm. Roundhouse, of course, chooses prototype outside-frame locos and sets the frames so that 45mm is practical, with 32mm as an option. [So you need to check a used engine to see what it is set for.]
As far as how it goes - it's a Roundhouse. They are the 'gold standard' for ease of use.
I don't have one, but I know a load of guys who do and I am sure they will chime in with their experiences.