By 'train' do you mean locomotive? As a steam model, it is most definitely not a beginner's model by any stretch of the imagination. They are very large, and very heavy, and require 'driving' and will require large sweeping curves to run on.
The Accucraft GS4 locomotive IS most certainly Gauge 1 - 1/32nd scale. Only the Accucraft cars [the full-scale original sets VERY rare these days, the last I saw were over $12K] or MTH cars [also pretty rare] will match them. The most recent iteration by Accucraft are reasonable models of a typical smoothsider car, and are therefore incorrect, but who's looking?
It's very hard for us here to advise you meaningfully, as we have no idea of your experience, one way or another. Is there anybody in Los Angeles Live Steamers who can give you first-hand advice?