Parking is available at N53.11.367 W004.04.961, where you will need to walk along a busy road heading to N53.11.554 W004.05.123, where you will see a sing for Lon Las Cycle Path. Take the top path and again you will be on the actual quarry train line, the train line beneath you was the passenger line from Bangor to Bethesda, after finding the cache you have a choice either take the return walk or continue along the line, and at the end of the path turn left and continue your walk up the hill pass the local watering hole, you will end up back at the parking location.
This stage of the track takes you through the village of Tregarth, the village grew around the local slate industry with many houses being built to house quarry workers and their families. The village is renowned for a street of houses that were built by Lord Penrhyn, proprietor of the Penrhyn Quarry and occupier of Penrhyn Castle, to accommodate the workers that refused to strike during the Penrhyn Lockout of 1900-1903. The street, Tanrhiw Road, was known locally as 'Stryd y Gynffon' (Traitor's Row) and was one of the first main settlements in the village based alongside the farmsteads of Ty'n Clawdd, Tanrhiw Isaf and Tanrhiw Uchaf.