Developed directly from the prototype, ScaleSeven modelling uses the minimum of scaling compromises to produce the most accurate models. ScaleSeven uses a track gauge of 33mm which is the exact 7mm scale representation of the prototype.

• Prototype drawings used for model construction do not require modifications to accommodate wheelsets.
• Trackwork can be an exact scale copy of the prototype.
• Many 7mm kits can be adapted or modified to run on ScaleSeven trackwork.

• There is limited equipment commercially available specifically for ScaleSeven
• Wheelsets and track are not compatible with any of the 32mm gauge standards.
• Reduced tolerances demand a high standard of workmanship.
• Rolling stock requires sprung or compensated wheelsets.
• Curves must be closer to prototype than other standards requiring more space for a given layout.

The Scale 7 Society publishes information on track standards on their website:
https://www.scaleseven.org.uk/index.php?id=67