Mathias-1259976

Actually NEM 110 and NEM 310 allow up to 0.2 mm deviation for the rail distance. So if you'd build your own TT:120 tracks with the scale correct 11.9583 mm gauge you'd still be perfectly within the spec and have absolutly no issue with available rolling stock... 😉

Is that just the analog sets, or does Hornby also ship sound equipped sets already?

Moving from DCC to Bluetooth seems like a very interesting step. Does Hornby plan to document the Bluetooth protocol, so that it can be supported by model control systems for PC, like Rocrail, or iTrain, and the like?

You should find quite some models and enthusiasts when searching for TTm and TTe. It's a small but active scene: