The Inglenook South shunting puzzle layout features a hidden siding. The hidden siding, or storage area, is located towards the back of the layout, behind the head shunt. The hidden siding measures two feet in length, so it can accommodate a two carriage multiple unit, the longest being the class 15x or 17x traction.
The Hornby Period Signal Box R9729 is used to obscure the hidden siding from view, along with a footbridge over the top to help too. The hidden siding is where the accessories are controlled from, using the Peco PL-27 switch console, it operate the points, signals and internal lighting in the houses.