Regular freight traffic to Trawsfynydd nuclear power station ceased in 1995, and the power station is being decommissioned. The line's proximity to the River Conwy at its northern end has led to periodic problems with flooding over the years. In 2004, 2005 and 2019 floods resulted in prolonged closures whilst the trackbed and embankments were rebuilt - the 2004 floods putting the line out of action from early February until 22 May that year. The line was again closed from 27 December 2015 for seven weeks, after the formation was damaged by floodwater in more than 100 places following heavy rain on Boxing Day. A further closure occurred between February and April 2017 after Storm Doris, when a tree fell on the track near Pont-y-Pant. Engineers had to move over 300 tonnes of rock and fallen vegetation during the recovery work. In March 2019 the line closed again due to severe damage to infrastructure caused by Storm Gareth. The railway line reopened on 24 July 2019, in time for the National Eisteddfod near Llanrwst. Storm Ciara's heavy rainfall levels on 8-9 February 2020 once again caused damage to the trackbed near the Conwy estuary north of Llanrwst (closing the line yet again), with several sections having their ballast washed away. The line reopened on 28 September following repair work and additional mitigation work in vulnerable locations. Progress the repair work was partly affected by the COVID-19 pandemic. The Ffestiniog tunnel has also given infrastructure operator Network Rail difficulties in recent years, with two separate closures (October 2017 and again in January 2019) required to repair water damage to the tunnel roof and a subsequent rockfall. Modern services The line from Llandudno Junction to Blaenau is single track, and includes the longest single track railway tunnel in the United Kingdom (over ). The line's summit above sea level is located midway through the tunnel and the gradients either side of it are as steep as 1-in-47 on the southbound ascent through Pont-y-pant and 1-in-43 on the climb out of the terminus at Blaenau for northbound trains. Between Llandudno Junction and Llandudno the service uses the double track Llandudno branch line from the North Wales Coast Line. The fully signalled passing loop at North Llanrwst is the last remaining between Llandudno Junction and Blaenau Ffestiniog and trains on the branch must stop at the signal box there to exchange tokens for the