Kato Unitrack · N scale · 29 pieces
Double Oval + Crossover — Kato Unitrack N scale plan
Two concentric mains linked by a double crossover.
- Board
- 1,676 × 914 mm
66 × 36 in - Track footprint
- 1,502 × 696 mm
59.1 × 27.4 in, centerline - Pieces
- 29
1 double crossover - Geometry
- Closed
0 open ends
What it teaches
Two concentric ovals 33 mm apart, sharing a double crossover (20-210) on the near straight. The outer curves are R348-45 and the inner R315-45: 348 − 33 = 315, so both sets of curves share a center and the loops stay a constant 33 mm apart all the way round. The crossover's two mains are on exactly that spacing, which is what lets it bridge them.
Each loop's straights are 806 mm — the 310 mm crossover plus 2 × S248 on the near side, 3 × S248 + S62 on the far side — so each oval closes independently and the crossover simply joins them. The crossover is about half the price of the whole plan.
Why R348 outside R315 stays concentric →
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 | 10 | $2.50 | 4-pack | 3 packs (12 pcs, 2 spare) | $30.00 |
| 20-040 | S62 | 2 | $1.75 | 4-pack | 1 pack (4 pcs, 2 spare) | $7.00 |
| 20-120 | R315-45 | 8 | $2.50 | 4-pack | 2 packs (8 pcs) | $20.00 |
| 20-132 | R348-45 | 8 | $2.75 | 4-pack | 2 packs (8 pcs) | $22.00 |
| 20-210 | Double Crossover | 1 | $75.00 | single | 1 | $75.00 |
| Estimated total, per piece | $145.50 | |||||
| Buying whole packs — 8 packs + 1 piece | $154.00 | |||||
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.