Sounds like you are almost there; good progress.
My little Tich went "ok" today, but the lubricator was not lubricating, so I packed it in.
You asked about how long/far a Tich will run – mine has been around the Waushakum Live Steamers track, with the ups and downs and round abouts and bridges – I only would go around once, because the grades are long and steep, and the track is very long – 2,264 feet – whatever that is in metric.
It has also pulled about 500 lbs in passengers at Winnipeg, Manitoba (Track is flat, though) and two people around the Vancouver Island track.
Anything that is easy is not a challenge – you guys are mastering this little locomotive, and will have no problems with larger ones, should you go that way.
John.