O gauge is the scale where track becomes modelling in its own right, and Peco's bullhead flexi is built for exactly that scrutiny — their own claim is "unsurpassed standards for 7mm scale realism," and the detail backs it: wood-grain sleepers at correct scale width, and integrally moulded chairs complete with square-headed fixing bolts and wooden keys — at this scale, even the keys wedging the rail into its chairs are modelled. Code 124 nickel silver bullhead rail in flexible 914mm (36 inch) lengths: the classic chaired permanent way of British railways, sized for 7mm scale.

Bullhead: The British Look, Every Era

Bullhead rail in cast chairs was the standard of the steam age and lingers on secondary lines and sidings still — so from Edwardian branch to preserved railway, this is what British O gauge track should look like. Running a more modern image? Peco's O gauge flat-bottom range covers it, and the SL-713 transition track joins the two types on one layout — bullhead branch, flat-bottom main, exactly as the real network mixes them.

Joining and Wiring — Shared with OO

A pleasing quirk of Peco's system: Code 124 uses the same joiners as OO Code 100 — SL-10 conducting and SL-11 insulated — and the same PL-80 power feed joiners for solder-free electrical drops. If you've wired an OO layout, your O gauge joins identically, and the feed-little-and-often rule scales up with the track.

Laying at 7mm Scale

O gauge flexi is stouter than its OO cousin — curve it gently and progressively rather than forcing a radius in one go, and radius guides or Tracksetta-style templates make sweeping curves easy. Cut with a razor saw or heavy track cutters, clean the ends, and pin with SL-14 blackened pins. Compatible with Peco's O Setrack range where rigid geometry suits.

Specifications

Brand: Peco
Part Number: SL-700BH
Gauge: O (32mm), 7mm scale
Rail: Nickel silver, bullhead profile, Code 124
Detail: Scale-width wood-grain sleepers, chairs with bolts and keys
Type: Flexible plain-line track
Length: 914mm (36in) per piece
System Partners: SL-713 transition; SL-10/SL-11 joiners; PL-80 power feeds; O Setrack
Made In: Britain