up to the portals. A short gauge incline ran upwards from the portals to the surge shaft. The twin inclines replaced a temporary incline which ran diagonally across the hillside to the portals. In the 1950s, a new depot for the Upper Works Railway was built to the east of the factory, beyond the junction of the old and new routes. It was known as 'Possil Park', which was also the name of Balfour Beatty's depot in Glasgow, although there was no link between the two sites. The first part of the railway climbed steeply for at gradients of 1 in 30 or even 1 in 25. The junction with the branch to Adit 10 was from the start of the railway, and was at a height of . The branch ran back along the hillside for , rising to by its end. Most of the bridges on the line were originally timber trestles but all were subsequently rebuilt in steel using suitable scrap material from the factory. Near the middle point of the railway, at a location known as "central", there was a triangle for turning trains. There were three short branch lines on the Upper Works Railway. The portal incline railway joined the Upper Works Railway close to base camp. It climbed to a height of . Wagons were hauled by an electric winch at the top of the incline, which had a maximum gradient of 1 in . At Adit 10 there was a branch which was in length, while the third branch at Adit 7 was in length. Treig–Laggan railway This was a branch line some in length. Built in 1930, it ran from a junction with the Upper Works Railway to Laggan Dam on Loch Laggan. The branch crossed over the West Highland Railway at Fersit on a 26-span timber trestle bridge. Much of the bridge was gradually filled in to form an embankment. This section also included a short branch to Shaft C, which was in length. Closure In October 1971, heavy rainfall caused part of the Upper Works Railway to be washed away, leaving a gap of around in the track. Following this event, the future of the railway had to be considered. At that time, the Forestry Commission was constructing many access roads in the area. It was therefore decided that further roads should be built, rather than repair the track. However,