What is the best baseboard construction method?

Open-frame construction using 50x25mm softwood is the most popular. It is lighter than a flat top, allows scenery below track level, and is easy to modify. Flat-top (9mm ply on a frame) is simpler to build but heavier and limits scenic depth.

How wide should a baseboard be?

For OO gauge, 600mm is a practical maximum for single-sided access. If you can reach from both sides, up to 1200mm works. For N gauge, you can work narrower at 400-500mm. Never make it wider than your comfortable arm reach (about 700mm from the front edge).

How many sections should I divide the layout into?

Each section should be 1200-1500mm long for portability and storage. Sections longer than 1800mm become unwieldy. If you transport your layout to exhibitions, limit section width to fit through doorways (typically 750mm). Use bolts or dowels to align sections.

What timber should I use for baseboards?

Use 50x25mm PSE (planed smooth edges) softwood for frames. 9mm birch plywood for flat tops. 5mm cork sheet for track bed. Avoid MDF for frames as it is heavy and absorbs moisture. Hardwood is unnecessary and expensive — softwood is perfectly adequate.

ModelCalcs

Baseboard Calculator — Layout Construction

Plan baseboard dimensions, support spacing and materials for your model railway layout.

Total Length (mm)

Overall layout length along the front edge — it gets split into sections below

Total Width (mm)

Front-to-back depth. ~600mm is the reach limit for single-sided OO access; up to 1200mm if you can reach from both sides

ConstructionOpen frame (50×25mm softwood girders + risers) is lighter and lets scenery drop below track; flat top adds a full ply/MDF deck

Number of Sections

Split into portable boards — aim for 1200–1500mm each so they fit through doorways and aren't a two-person lift

Cost per Timber Length/Sheet (£, optional)

Approximate cost per 2.4m length

How We Calculate This

Calculates baseboard framing requirements based on your layout dimensions and chosen construction method.

Formula

Section length = Total length ÷ Number of sections
Cross members per section = ceil(Section length ÷ Spacing) + 1 (the +1 is the fencepost member — it already supplies the two end battens of every section)
Framing = (2 × Section length × Sections) + (Cross members × Width) — two full-length girders per section plus every cross member, ends included
Legs = Legs-per-section × Number of sections

Worked example: a 2400 × 600 mm layout split into 2 sections = 1200 mm boards. Cross members = ceil(1200 ÷ 350) + 1 = 5 per section (10 total). Framing = (2 × 1200 × 2) + (10 × 600) = 4800 + 6000 = 10,800 mm ≈ 10.8 m of 50 × 25 mm softwood, plus 8 legs.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.