Track system · HO scale

Atlas H0 Code 100: track pieces, radii and turnouts

Atlas H0 Code 100 is a two-rail track system without roadbed for HO scale.

The Trackplanner catalogue lists 38 pieces: 13 straights, 5 curves, 1 flex track, 10 turnouts, 1 Y turnout and 8 crossings. The curves come in 3 radii from 381 to 558.8 mm.

Key facts

ScaleHO scale
Rail systemtwo-rail
Roadbedno roadbed
Statuscurrent — in production and in the shops
Turnout motorsold separately: drive #65
Pieces in the catalogue38
Radii3 · 381–558.8 mm
Straight lengths19.1 · 25.4 · 31.8 · 38.1 · 50.8 · 63.5 · 76.2 · 152.4 · 228.6 mm
Turnout angles7.18° · 9.5° · 12.8° · 20°

Pieces by type

TypeCount
Straights13
Curves5
Flex tracks1
Turnouts10
Y turnouts1
Crossings8

Radii

Radius Angle Articles
381 mm 15° 832
457.2 mm 30° · 15° · 10° 833 · 834 · 835
558.8 mm 22.5° 836

Turnouts and crossings

ArticleTypeAngle
850 Turnout left 20°
851 Turnout right 20°
860 Turnout left 20°
861 Turnout right 20°
281 Turnout left 12.8°
282 Turnout right 12.8°
283 Turnout left 9.5°
284 Turnout right 9.5°
285 Turnout left 7.18°
286 Turnout right 7.18°
280 Y turnout —
176 Crossing 90°
171 Crossing 18.9°
172 Crossing —
173 Crossing —
174 Crossing —
175 Crossing —
177 Crossing —
839 Crossing —

All pieces

Show all 38 pieces
ArticleTypeDimensions
847-0.75Straight19.1 mm
847-1Straight25.4 mm
847-1.25Straight31.8 mm
825Straight38.1 mm
847-1.5Straight38.1 mm
847-2Straight50.8 mm
847-2.5Straight63.5 mm
823Straight76.2 mm
843Straight (end piece)82.6 mm
822Straight152.4 mm
821Straight228.6 mm
840Straight228.6 mm
849Straight228.6 mm
832CurveR 381 mm · 15°
833CurveR 457.2 mm · 30°
834CurveR 457.2 mm · 15°
835CurveR 457.2 mm · 10°
836CurveR 558.8 mm · 22.5°
168Flex track914 mm
850Turnout left20°
851Turnout right20°
860Turnout left20°
861Turnout right20°
281Turnout left12.8°
282Turnout right12.8°
283Turnout left9.5°
284Turnout right9.5°
285Turnout left7.18°
286Turnout right7.18°
280Y turnout—
176Crossing90°
171Crossing18.9°
172Crossing—
173Crossing—
174Crossing—
175Crossing—
177Crossing—
839Crossing—

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

Track plans with Atlas H0 Code 100

The gallery has 9 public track plans built with Atlas H0 Code 100. These are the ones it recommends right now:

See all 9 track plans with Atlas H0 Code 100 →

Changes

9 November 2026

  • 834 New

    New: curve 834, 18" radius (457.2 mm), 15°, the half section of curve 833.

  • 836 Shape corrected Appearance

    Curve 836 corrected: 22.5° instead of 30°. According to Atlas, 16 pieces make a circle.

  • 840 New

    New: terminal track 840, straight 9" (228.6 mm). Same shape as straight 821.

  • 847-0.75 New

    New: short straight 3/4" (19.05 mm) from assortment 847.

  • 847-1.25 New

    New: short straight 1 1/4" (31.75 mm) from assortment 847.

  • 847-1.5 New

    New: short straight 1 1/2" (38.1 mm) from assortment 847. Same shape as straight 825.

  • 847-2.5 New

    New: short straight 2 1/2" (63.5 mm) from assortment 847.

15 October 2026

  • 172 New

    New: 172 – 25° crossing

  • 173 New

    New: 173 – 30° crossing

  • 174 New

    New: 174 – 45° crossing

  • 175 New

    New: 175 – 60° crossing

  • 177 New

    New: 177 – 12.5° crossing

  • 839 New

    New: 839 – 30° snap crossing

  • 850 Shape corrected Type corrected Appearance

    Hand and diverging route corrected: according to Atlas, 850 is the left-hand switch (previously listed as right-hand). The diverging end now lies 1½" (3.8 cm) further out, as in the Atlas catalog (1½" straight plus an 18" radius curve over 20°). Rails and sleepers redrawn.

  • 851 Shape corrected Type corrected Appearance

    Hand and diverging route corrected: according to Atlas, 851 is the right-hand switch (previously listed as left-hand). The diverging end now lies 1½" (3.8 cm) further out, as in the Atlas catalog. Rails and sleepers redrawn.

  • 860 New

    New: 860 – manual snap switch, left

  • 861 New

    New: 861 – manual snap switch, right

12 October 2026

  • 171 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.

  • 176 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.

  • 280 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.

  • 281 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.

  • 282 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.

  • 283 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.

  • 284 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.

  • 285 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.

  • 286 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.

  • 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.

  • 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.

8 October 2026

  • 168 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.

  • 171 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.

  • 176 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.

  • 280 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.

  • 281 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.

  • 282 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.

  • 283 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.

  • 284 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.

  • 285 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.

  • 286 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.

  • 821 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.

  • 822 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.

  • 823 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.

  • 825 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.

  • 832 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.

  • 833 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.

  • 835 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.

  • 836 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.

  • 843 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.

  • 847-1 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.

4 more

  • 847-2 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.

  • 849 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.

  • 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.

  • 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.

7 October 2026

  • 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

  • 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

5 October 2026

  • 843 Shape corrected Appearance

    The bumper was drawn as a 2 cm piece of track with the buffer beam at the joint. It is a bumper on its own 3¼ in (82.6 mm) track section; the buffer beam now stands at the end of that track.

  • 283 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).

  • 284 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).

  • 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).

  • 171 Shape corrected Appearance

    Drawing corrected: the second route of the crossing is now a straight line between its ends (previously an arc of a few centimetres radius); rails and sleepers redrawn.

  • 850 Appearance

    End sleeper added at the joint (joint marker).

  • 851 Appearance

    End sleeper added at the joint (joint marker).

  • 171 Appearance

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

  • 280 Appearance

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

  • 281 Appearance

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

  • 282 Appearance

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

  • 283 Appearance

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

  • 284 Appearance

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

  • 285 Appearance

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

  • 286 Appearance

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

  • 850 Appearance

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

  • 851 Appearance

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