Ttarrag Shed is the layout that is operated by the 16mmGO&OA.
The layout currently measures 30' long & 10'6" wide.

It is operated by a team of 'Passed Runners' who have all been assessed, trained & passed out for running on Ttarrag Shed.
The above photo was taken in 2008 at the National Garden Railway Show - Stoneleigh & shows the 'magic eleven', a team of passed runners who fired non stop all day.
From left to right, i give you - Ian Rolfe, Derek Pollard, Max Hampson, John Burnett, Chris Moody, Bob Kirchner, Julian Smith, Eileen Moody, Dave Marshall, Eddie Bull & at the front, John Brittian (clutching his hands with pre show nerves...).
The Garratts (& that's generally the only type of locomotive we run here) are also passed out for running on the layout - the aim is to provide a fleet of locomotives that are reliable & will give trouble free operation at shows/exhibitions.
Ttarrag Shed itself is a representation of a loco shed with water/coaling/ashing facilities & it's location could be anywhere in the world - Wales, South Africa, anywhere at all.
In the real world, the yard is situated next to the double track main line with Gattarr Junction just a couple of miles away.