Kato Unitrack · N scale · 21 pieces
Figure-8 — Kato Unitrack N scale plan
A single line that crosses over itself through a 90° crossing.
- Board
- 1,524 × 1,524 mm
60 × 60 in - Track footprint
- 1,392 × 1,392 mm
54.8 × 54.8 in, centerline - Pieces
- 21
0 turnouts - Geometry
- Closed
0 open ends
What it teaches
A single line that crosses itself through the 90° crossing (20-320). The crossing's four arms sit 62 mm from its center, and R348 − 62 = 286 = S248 + S38 — so each tail is an S248 and an S38, and each lobe is six R348-45 curves, 270° of turn, that come back exactly onto the perpendicular arm. The two lobes use opposite hands; that is what makes an 8 rather than a loop.
The S38 is listed under Kato's 20-092 short-straight assortment, so RailMind counts it by the piece rather than by the pack. The rest is three packs of R348-45, one of S248 and the crossing.
The arithmetic that lands each lobe back on the crossing →
Parts list
Grouped by the Kato part number you actually buy — a curve's left and right hands are one part. Quantities, pack sizes and prices are the ones RailMind's parts list computes for this plan.
| Kato part | Piece | Qty | Each | Sold as | Buy | Cost |
|---|---|---|---|---|---|---|
| 20-000 | S248 | 4 | $2.50 | 4-pack | 1 pack (4 pcs) | $10.00 |
| 20-092 | S38 | 4 | $3.00 | single | 4 | $12.00 |
| 20-132 | R348-45 | 12 | $2.75 | 4-pack | 3 packs (12 pcs) | $33.00 |
| 20-320 | 90° Crossing | 1 | $17.50 | single | 1 | $17.50 |
| Estimated total, per piece | $72.50 | |||||
| Buying whole packs — 4 packs + 5 pieces | $72.50 | |||||
Approximate US retail per piece — Kato sells most track in packs, and street prices vary. Use as a planning estimate. The per-piece total is what the pieces cost; the whole-pack total is what you pay at the counter when a pack leaves spares.
Build it
RailMind ships this plan in its example gallery. Open it, edit it, and print it at true size — tiled across Letter or A4 with registration marks — to lay the track over. The parts list above is the one it produces, and it will check it against the track you already own.
iPad only · iPadOS 18 or later · free to build a starter layout, one US$29.99 purchase to unlock every piece.