the diesel train fleet, with capacity to store 70 railcars with over 11 kilometres of track. The depot has been designed to allow future conversion to support electric rolling stock. To facilitate work on the Torrens Rail Junction in 2017, the Gawler line between Adelaide and Mawson Lakes was closed from 1–15 October and 18 November to 5 December. Following a decade of on-again, off-again talks, electrification of the Gawler line was announced in 2018. The announcement only promised Stage 1 electrification as far as Salisbury with works anticipated to commence in 2018, but a $220 million grant from the Federal Government also allowed for Stage 2 electrification for the remainder of the line to proceed. Works commenced in November 2019 with completion anticipated in 2021. Contrary to the Seaford line electrification which saw the line closed completely for 11 months, from October 2020 onward, main construction on the Gawler line is being spread out across a rolling schedule of partial and full line closures across 12 months; early works before October 2020 were spread across smaller closures typically at nights and on weekends. The entire line was closed on 25 December 2020; it was intended to reopen in November 2021 but was delayed due to restrictions regarding the COVID-19 lockdown in July. The line was expected to reopen around 30 April 2022, but following the state election in March, the reopening was pushed back to the end of June. The line was reopened on 12 June. Only three A-City 4000 class will run along the line to begin with; the 3000/3100 class will continue to serve the line until at least March 2023. An overpass over the railway line next to Ovingham railway station is currently under construction, and is expected to be finished in 2023; the Torrens Road overpass will replace a level crossing. Ovingham station was partly demolished in March 2022, and will remain closed when the line reopens. Route The line runs from Adelaide station north via Prospect, Mawson Lakes, Salisbury, Elizabeth and Smithfield to the town Gawler on the outer northern metropolitan fringe. The line is in length and is currently the longest of the Adelaide suburban railway lines. Like the rest of the Adelaide suburban passenger rail network, the line is broad gauge for its entire length. The Australian Rail Track Corporation's standard gauge Adelaide to Port Augusta line runs parallel to the route