A simple hide to start things off, keep an eye out for the cascade.
BST - Bryngwyn Slate Trail
This is the first cache in a series of 15 following the trackbed of the former North Wales Narrow Gauge Railways 'Bryngwyn Branch' - now a community owned footpath. The railway once served the slate quarries surrounding Moel Tryfan, as well as passengers from Rhostryfan and Bryngwyn Stations. The line carried slate and passengers down to Caernarfon and beyond, but closed with the decline of the slate industry in the early 20th century. The rails were lifted during the 1940s for the war effort, though some interesting features still remain en route.
For the full experience you can step off the WHR train at Tryfan Junction, complete the series, and return for the journey back. By car, parking is easiest at Rhostryfan former station, allowing you to split the series into two halves. It is also possible to park on the verge at Tryfan Junction or up by the Drumhead right at the other end of the line.
The walk to Bryngwyn is easy-going with only a gentle (undetectable) uphill gradient. The permissive footpath along the trackbed ends abruptly at Bryngwyn Farm, where the final cache (15) is hidden, but if desired, you can roughly follow the remaining trackbed along lanes and the old Bryngwyn Incline to the 'Drumhead', where the railway once diverged into several private tramways serving the individual slate quarries. There are three SideTracked caches along the track, plus two additional bonus caches for those willing to follow the trackbed all the way from the end of the footpath to the Drumhead. All in all that's 20 caches, some simple, others more challenging...
The map shows the Bryngwyn Slate Trail from Tryfan Junction to the Drumhead, also where the trackbed (orange) diverges from the walkable route (purple). The modern Welsh Highland track is shown in blue.