TT 120 Scale and Gauge Comparisons

Scale And Gauge

Narrow-Gauge Trains on 3'6" at 1:120 track gauge is close to 9 mm (8.8 mm to be precise)

This can use ordinary N gauge or the new Peco mainline 009 track

Standard Gauge Trains on 4' 8 1/2 " at 1:120 track gauge is close to 12mm (11.95 to be precise)

This is available through both Peco and Tillig

Broad gauge Trains on 5'3" at 1:120 Track Gauge is 12.7

We suggest Tillig 12mm trackwork

We have chosen a quite unusual scale of 2.6 mm to the foot as a means of scaling the rolling stock rather than strict 1:120 scale as it gives us a little more flexibility with the slightly smaller Australian prototype, especially in the narrow gauge models.

The track gauge at this scale is just a fraction of a mm undersize in the Standard Gauge and the Narrow gauge which is hardly noticeable.

Modelling on the broad gauge we suggest that using 12 mm track would still be appropriate, but you may them want to use the continental exact scale of 1:120 which gives a more accurate track gauge all be it still a tad undersize

Narrow gauge 3' 6"' in 2.6 mm to ft = 9.1 mm

Standard gauge 4' 8.5" in 2.6 mm to ft = 12.3 mm

Broad Gauge 5' 3" in 2.6 mm to ft = 13.6 mm

5' 3" in exact 1:120 scale =12.7 mm

As far as wheels standards go we have found that N gauge wheels and mechanisms work fine for the narrow gauge

For narrow gauge 3'6'' 2mm society wheels are an option.

European TT models are fine for the standard gauge, however, they are expensive.

For steam, in standard gauge, it may be best to get wheels from the 3mm society in the Uk and hand build the chassis.

Getting an exact match can be a little tricky.

But who knows with 3D printing we may be able to get special wheels and other bits done over time if there is enough interest

So as we said we have just made a start and not sure where we will go in the future.