Start with a small KATO UNITRACK oval, an open-ended passing station or a shelf terminal. Compare track quantities and planning dimensions, then edit the plan online.
ROKHELM editorial team · Geometry checked 9 October 2026
Before opening a plan
Save any existing planner draft as JSON. Each link opens a new planner tab and loads the example instead of the saved draft; later edits may update the shared browser autosave.
Read the beta warning, then zoom out or pan to see the whole plan. Share links load track only, not the board or scenery.
Set the proposed board dimensions and check the exact train’s manual before changing track. Dry-fit before buying the full list or fixing scenery.
Small oval: continuous running with one train
A starting point for joining track, adding power and testing slow running. R249 is this plan’s radius, not a promise that every train will run on it.
Digital centerline diagram. Not a construction drawing.
Centerline extent
746.0 × 498.0 mm
Planning board
900 × 650 mm
Track pieces
10
There is no passing siding or isolated parking track. Check the exact train’s minimum radius and body overhang first.
Track quantities — individual pieces, not retail packs
Part
Description
Quantity
20-000
Straight 248mm
2
20-100
Curve R249-45°
8
Track only: feeders, power pack, turnout controls, insulated joiners, bumpers, structures and platforms are not included. Decide on wiring and protection separately.
Two #6 turnouts form a passing siding, with approach tracks at each end. This is a station section, not a complete continuous-running layout.
Digital centerline diagram. Not a construction drawing.
Centerline extent
2851.3 × 65.5 mm
Planning board
3000 × 300 mm
Track pieces
18
Nominal dimensions leave about 0.7 mm of total mismatch at the exit. The digital model splits it between two joints. Dry-fit the actual track; screen connections are not a purchasing guarantee.
Track quantities — individual pieces, not retail packs
Part
Description
Quantity
20-000
Straight 248mm
12
20-030
Straight 64mm
2
20-150
Curve R718-15°
2
20-202
Electric Turnout #6 Left
1
20-203
Electric Turnout #6 Right
1
Track only: feeders, power pack, turnout controls, insulated joiners, bumpers, structures and platforms are not included. Decide on wiring and protection separately.
One #6 turnout leads to a spur for stopping and reversing movements. The ends remain open and offer no protection against a train running off the edge.
Digital centerline diagram. Not a construction drawing.
Centerline extent
1673.8 × 152.8 mm
Planning board
1800 × 350 mm
Track pieces
9
There is no runaround track, so a locomotive cannot change ends around its train. Add suitable stops, edge protection and wiring before operating a real model.
Track quantities — individual pieces, not retail packs
Part
Description
Quantity
20-000
Straight 248mm
8
20-202
Electric Turnout #6 Left
1
Track only: feeders, power pack, turnout controls, insulated joiners, bumpers, structures and platforms are not included. Decide on wiring and protection separately.
KATO sources confirm the named track sizes and part numbers; they do not certify our three examples. ROKHELM’s automated checks compare the generated diagrams, quantities and encoded plans. Bounds describe track centerlines only. The passing example retains the planner’s nominal-dimension approximation.