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This is an additional circuit kit for our a Helix Starter kit and is suitable for N gauge British Outline 3rd radius curved track ONLY  (Peco, Hornby or Bachmann)and has a track bed approx 36mm wide.  It can follow the starter kit in being built either rising clockwise or anticlockwise.

Our Helix kits are laser cut from 6mm thick lightweight Poplar ply, not MDF.  Poplar ply being a lot more stable and longer lasting than other substrates.  All joints are fully supported.

The circuit kit is to increase the total height of the helix by adding additional circuits and each circuit will rise approx 40mm.  With the starter kit giving you a height of approx 72 mm (allowing a starting height of 12mm from ground level to cover the initial nuts/washers and divider plate) you will end up with the following.

1 x Additional Circuit Kit + Starter Kit                   112 mm total rise in height.

2 x Additional Circuit Kits + Starter Kit                 152 mm total rise in height.

3 x Additional Circuit Kits + Starter Kit                 192 mm total rise in height.

4 x Additional Circuit Kits + Starter Kit                 232 mm total rise in height.

5 x Additional Circuit Kits + Starter Kit                 272 mm total rise in height.

The circuit based on 3rd Radius curves of 298.5 mm has a gradient of 1 in 2.13%.

This pack comes with the following:

8x     1/8 circle sections with engraved lines to help with track alignment

8x  Connecting bridges including 8x inner segment guides, 8x outer segment guides

All required nuts and washers 


You will need our  N Gauge 3rd Radius Curve ONLY Starter Kit and basic tools to build your helix

Other bespoke Radii are available to order please contact us for a quotation. 

The above figures do not take into account any underlay thickness, so if using this, then the thickness of the underlay will need to be taken into account for each turn.


Please Note:

All Helices are made to order and will take approx 2-3 weeks to produce unless shown in stock

No Baseboards are included, they are available to special order, please contact us for more info.



Features / Specification

Please Note:  The pictures of the helix under construction were not fixed and have just been erected to show what comes with the kit, 2nd and 3rd photographs for image illustration purposes only and shows our OO gauge helix.

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360 Degree Circuit for N Gauge 3rd Radius Curve ONLY for the Helix Starter Kit

£34.95 inc. VAT
Out of stock - preorder now