The Hornby Extension pack system makes it easy to extend your train track.

After starting with a basic oval  and Trackmat, usually found in your train set, you can then add progressive extension packs as and when you require, until you have achieved the full  trakmat layout.

Add R8223 Extension Pack C (shown in red)to the Starter Oval plus Extension Packs A and B to make this layout.

If running analogue the inner circle will need a further transformer and controller, or you can swap to a twin track controller such as GMCD

https://www.sportsandmodelshop.co.uk/product/trains/analogue-controllers-and-accessories/gaugemaster-mode…cased-controller/