Track system · HO scale

Kato Unitrack HO: track pieces, radii and turnouts

Kato Unitrack HO is a two-rail track system with integrated roadbed for HO scale.

The Trackplanner catalogue lists 41 pieces: 13 straights, 17 curves, 10 turnouts and 1 crossing. The curves come in 11 radii from 370 to 1606 mm.

Key facts

Scale	HO scale
Rail system	two-rail
Roadbed	integrated roadbed
Status	current — in production and in the shops
Turnout motor	sold separately: drive 2-503 (left) / 2-504 (right)
Pieces in the catalogue	41
Radii	11 · 370–1606 mm
Straight lengths	60 · 94 · 114 · 123 · 149 · 174 · 227 · 246 · 369 mm
Turnout angles	10° · 19° · 22.5°

Pieces by type

Type	Count
Straights	13
Curves	17
Turnouts	10
Crossings	1

Radii

Radius	Angle	Articles
370 mm	22.5°	2-280
430 mm	22.5°	2-260
490 mm	22.5°	2-270
550 mm	22.5°	2-210
610 mm	22.5°	2-220
670 mm	22.5°	2-230
730 mm	22.5°	2-240 · 2-241 · 2-242
790 mm	22.5°	2-250 · 2-251 · 2-252
867 mm	10°	2-290
1546 mm	11.25°	2-321
1606 mm	11.25°	2-331

Helix kits for this system

These kits have a radius that matches one of the system’s curves (within 5 mm). The helix assistant in Trackplanner checks whether the clearance is enough for your rolling stock.

Kit	Fits	Gradient	Clearance	Buy
Gleiswendelshop (Tobias Fischer) H0 helix, R2, single track (2–8 turns)	for 43.0 cm	3.70 %	—	From the maker
Gleiswendelshop (Tobias Fischer) H0 helix, R2/R3, double track (2–8 turns)	for 43.0 cm and 49.0 cm	3.70 % inner, 3.25 % outer	—	From the maker
Gleiswendelshop (Tobias Fischer) H0 helix, R3, single track (2–8 turns)	for 49.0 cm	3.25 %	—	From the maker
Gleiswendelshop (Tobias Fischer) H0 helix, R3/R4, double track (2–8 turns)	for 49.0 cm and 55.0 cm	3.25 % inner, 2.89 % outer	—	From the maker
The Model Railroad Benchwork Store HO Scale Helix Kit, single track, 4.5 turns	for 79.0 cm	2.30 %	95.3 mm	From the maker
The Model Railroad Benchwork Store HO Scale Helix Kit, single track, 5.5 turns	for 79.0 cm	2.30 %	95.3 mm	From the maker
The Model Railroad Benchwork Store HO Scale Helix Kit, double track, 4.5 turns	for 79.0 cm and 86.7 cm	2.30 % inner, 2.10 % outer	95.3 mm	From the maker
The Model Railroad Benchwork Store HO Scale Helix Kit, double track, 5.5 turns	for 79.0 cm and 86.7 cm	2.30 % inner, 2.10 % outer	95.3 mm	From the maker

All helix kits →

Turnouts and crossings

Article	Type	Angle
2-840	Turnout left	22.5°
2-841	Turnout right	22.5°
2-850	Turnout left	19°
2-851	Turnout right	19°
2-852	Turnout left	19°
2-853	Turnout right	19°
2-860	Turnout left	10°
2-861	Turnout right	10°
2-862	Turnout left	10°
2-863	Turnout right	10°
2-401	Crossing	—

All pieces

Show all 41 pieces

Article	Type	Dimensions
2-105	Straight	60 mm
2-111	Straight	94 mm
2-170	Straight (end piece)	109 mm
2-120	Straight	114 mm
2-140	Straight	123 mm
2-142	Straight	123 mm
2-143	Straight	123 mm
2-193	Straight	149 mm
2-130	Straight	174 mm
2-160	Straight	227 mm
2-150	Straight	246 mm
2-151	Straight	246 mm
2-180	Straight	369 mm
2-280	Curve	R 370 mm · 22.5°
2-260	Curve	R 430 mm · 22.5°
2-270	Curve	R 490 mm · 22.5°
2-210	Curve	R 550 mm · 22.5°
2-220	Curve	R 610 mm · 22.5°
2-230	Curve	R 670 mm · 22.5°
2-240	Curve	R 730 mm · 22.5°
2-241	Curve	R 730 mm · 22.5°
2-242	Curve	R 730 mm · 22.5°
2-242	Curve	R 730 mm · 22.5°
2-250	Curve	R 790 mm · 22.5°
2-251	Curve	R 790 mm · 22.5°
2-252	Curve	R 790 mm · 22.5°
2-252	Curve	R 790 mm · 22.5°
2-290	Curve	R 867 mm · 10°
2-321	Curve	R 1546 mm · 11.25°
2-331	Curve	R 1606 mm · 11.25°
2-840	Turnout left	22.5°
2-841	Turnout right	22.5°
2-850	Turnout left	19°
2-851	Turnout right	19°
2-852	Turnout left	19°
2-853	Turnout right	19°
2-860	Turnout left	10°
2-861	Turnout right	10°
2-862	Turnout left	10°
2-863	Turnout right	10°
2-401	Crossing	—

Dimensions in mm, angles in degrees, from the Trackplanner catalogue. Where the data does not give a value unambiguously, the field stays empty.

Changes

19 October 2026

2-142 New

New: rerailer track in road-crossing style, straight 123 mm (2-142).
2-241 New

New: superelevated curve R730 22.5° with concrete ties (2-241). It is drawn flat; position and size match curve 2-240.
2-242 New

New: superelevated easement curve R730 22.5°, cant on the left (2-242). It is drawn flat; position and size match curve 2-240.
2-242 New

New: superelevated easement curve R730 22.5°, cant on the right (2-242). Drawn flat; from the flat end it bends the other way than the easement curve with cant on the left.
2-251 New

New: superelevated curve R790 22.5° with concrete ties (2-251). It is drawn flat; position and size match curve 2-250.
2-252 New

New: superelevated easement curve R790 22.5°, cant on the left (2-252). It is drawn flat; position and size match curve 2-250.
2-252 New

New: superelevated easement curve R790 22.5°, cant on the right (2-252). Drawn flat; from the flat end it bends the other way than the easement curve with cant on the left.
2-280 New

New: curve R370 22.5° (2-280), the smallest radius of the range; 16 pieces make a full circle.
2-321 New

New: curve R1546 11.25° with concrete ties, not superelevated (2-321).
2-331 New

New: curve R1606 11.25° with concrete ties, not superelevated (2-331).
2-852 New

New: #4 turnout left, manual, R550 19°, 185 mm (2-852). Same dimensions as the electric turnout 2-850.
2-853 New

New: #4 turnout right, manual, R550 19°, 185 mm (2-853). Same dimensions as the electric turnout 2-851.

12 October 2026

2-140 Number/name corrected

The 123 mm straight was listed under article number 2-120. KATO sells it as 2-140; 2-120 is KATO’s 114 mm straight. Shape and length stay the same, and the parts list now shows 2-140.
2-120 Number/name corrected

The 114 mm straight was listed under article number 2-140. KATO sells it as 2-120; 2-140 is KATO’s 123 mm straight. Shape and length stay the same, and the parts list now shows 2-120.
2-290 Shape corrected Appearance

Curve 2-290 was drawn with a 550 mm radius. KATO sells 2-290 as the R867 10° curve. The piece now has an 867 mm radius and is 15.1 cm instead of 9.6 cm long. In saved plans its joints move accordingly.
2-401 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.
2-840 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.
2-841 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.
2-850 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.
2-851 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.
2-860 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.
2-861 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.
2-862 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.
2-863 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

2-105 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.
2-111 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.
2-140 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.
2-130 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.
2-120 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.
2-143 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.
2-150 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.
2-151 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.
2-160 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.
2-170 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.
2-180 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.
2-193 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.
2-210 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.
2-220 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.
2-230 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.
2-240 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.
2-250 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.
2-260 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.
2-270 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.
2-290 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.

9 more

2-401 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.
2-840 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.
2-841 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.
2-850 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.
2-851 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.
2-860 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.
2-861 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.
2-862 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.
2-863 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.

7 October 2026

2-850 Type corrected

The turnout has a factory-fitted drive. The parts list no longer adds a separate turnout drive for it; the control panel and decoders still count it. Source
2-851 Type corrected

The turnout has a factory-fitted drive. The parts list no longer adds a separate turnout drive for it; the control panel and decoders still count it. Source
2-860 Type corrected

The turnout has a factory-fitted drive. The parts list no longer adds a separate turnout drive for it; the control panel and decoders still count it. Source
2-861 Type corrected

The turnout has a factory-fitted drive. The parts list no longer adds a separate turnout drive for it; the control panel and decoders still count it. Source

5 October 2026

2-840 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-841 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-850 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-851 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-860 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-861 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-862 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-863 Appearance

Sleeper layout corrected: long turnout and crossing sleepers now reach under the rails of the diverging or crossing track (a sleeper was missing there in places).
2-840 Appearance

End sleeper added at the joint (joint marker).
2-841 Appearance

End sleeper added at the joint (joint marker).
2-850 Appearance

End sleeper added at the joint (joint marker).
2-851 Appearance

End sleeper added at the joint (joint marker).
2-860 Appearance

End sleeper added at the joint (joint marker).
2-861 Appearance

End sleeper added at the joint (joint marker).
2-862 Appearance

End sleeper added at the joint (joint marker).
2-863 Appearance

End sleeper added at the joint (joint marker).
2-210 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-220 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-230 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-240 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.

13 more

2-250 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-260 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-270 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-290 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-401 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-840 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-841 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-850 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-851 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-860 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-861 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-862 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.
2-863 Appearance

Sleeper layout tidied: duplicate sleepers of overlapping routes removed, long turnout timbers, gaps closed.