I can't find much info on the actual dimensions of the full size, but
the Porter 0-4-0 typically had a track gauge of 1m (overseas) to
42" (domestic). that puts the trackage illustrated 42/120, or .35"
Essentially they would be TT Gauge (From "Table Top") which was only
popular in England and eastern Europe. It's also called 3mm scale.
I have some from an older repop and the engines (from what I recall)
did not come with tenders; you can use them for narrow gauge
background items with HO if you wanted to.
The wagons are close to HO (1/90 versus 1/87) so are immediately
One Nitpick - the Pioneer was a small Central Pacific locomotive that
had the tender attached directly to the back of the locomotive.
Filling it up with pieces of matchsticks gave the appearance of a load
That said, these kits were repops of very old ITC kits. I've made a
couple of them in vignettes and found that the fit on HO guage track
quite nicely. However $7.00 is a bit much for these, I've seen them
generally running for a couple of bucks.
1:120 is TT gauge/scale. It is between H0 (1:87) and N (1:160) scale.
You can also post your question on rec.models.railroad . Currently
bunch of bored guys are discussing off-topic things there. They would
welcome a real model railroad question!