Track system · TT scale
Kühn TT: track pieces, radii and turnouts
Kühn TT is a two-rail track system without roadbed for TT scale. The system is historic and no longer made. Kühn handed its TT range, including the tooling, to Roco in 2023. In the Trackplanner the track is now listed as “Roco TT”.
The Trackplanner catalogue lists 18 pieces: 5 straights, 5 curves, 1 flex track, 4 turnouts, 2 curved turnouts and 1 double slip. The curves come in 2 radii from 321 to 365 mm.
Key facts
| Scale | TT scale |
|---|---|
| Rail system | two-rail |
| Roadbed | no roadbed |
| Status | historic — no longer made |
| Turnout motor | sold separately: drive 86112 by Tillig |
| Pieces in the catalogue | 18 |
| Radii | 2 · 321–365 mm |
| Straight lengths | 44 · 60.5 · 64.3 · 121 · 128.7 mm |
| Turnout angles | 10° · 20° |
Pieces by type
| Type | Count |
|---|---|
| Straights | 5 |
| Curves | 5 |
| Flex tracks | 1 |
| Turnouts | 4 |
| Curved turnouts | 2 |
| Double slips | 1 |
Radii
| Radius | Angle | Articles |
|---|---|---|
| 321 mm | 30° · 10° | 72110 · 72130 |
| 365 mm | 30° · 20° · 10° | 72210 · 72220 · 72230 |
Turnouts and crossings
| Article | Type | Angle |
|---|---|---|
| 72620 | Turnout left | 20° |
| 72621 | Turnout right | 20° |
| 72640 | Turnout left | 10° |
| 72641 | Turnout right | 10° |
| 72630 | Curved turnout left | — |
| 72631 | Curved turnout right | — |
| 72600 | Double slip | 20° |
All pieces
Show all 18 pieces
| Article | Type | Dimensions |
|---|---|---|
| 71044 | Straight | 44 mm |
| 71060 | Straight | 60.5 mm |
| 71064 | Straight | 64.3 mm |
| 71121 | Straight | 121 mm |
| 71128 | Straight | 128.7 mm |
| 72130 | Curve | R 321 mm · 30° |
| 72110 | Curve | R 321 mm · 10° |
| 72230 | Curve | R 365 mm · 30° |
| 72220 | Curve | R 365 mm · 20° |
| 72210 | Curve | R 365 mm · 10° |
| 71640 | Flex track | 640 mm |
| 72620 | Turnout left | 20° |
| 72621 | Turnout right | 20° |
| 72640 | Turnout left | 10° |
| 72641 | Turnout right | 10° |
| 72630 | Curved turnout left | — |
| 72631 | Curved turnout right | — |
| 72600 | Double slip | 20° |
Dimensions in mm, angles in degrees, from the Trackplanner catalogue. Where the data does not give a value unambiguously, the field stays empty.
Changes
12 October 2026
-
72600 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
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72620 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
-
72621 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
-
72630 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
-
72631 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
-
72640 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
-
72641 Appearance
Turnouts and crossings were missing sleepers, mostly near the joints. The gaps are closed, and the sleepers there are spaced like on the rest of the track.
8 October 2026
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71044 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
71060 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
71064 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
71121 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
71128 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
71640 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72110 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72130 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72210 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72220 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72230 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72600 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72620 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72621 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72630 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72631 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72640 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
-
72641 Appearance
Sleepers and rails brought in line with the prototype: sleepers spaced 0.60 m apart, rails placed so the gap between them is exactly the track gauge. Connectors and track dimensions are unchanged.
5 October 2026
-
72620 Appearance
End sleeper added at the joint (joint marker).
-
72621 Appearance
End sleeper added at the joint (joint marker).
-
72630 Appearance
End sleeper added at the joint (joint marker).
-
72631 Appearance
End sleeper added at the joint (joint marker).
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72600 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
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72620 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
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72621 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
-
72630 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
-
72631 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
-
72640 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
-
72641 Appearance
Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.