an empty train travelling at low speed crashed into an occupied train carrying about 40 passengers stopped at Clarkson station. Three people were taken to hospital as a precaution, and five people suffered sore necks due to the crash. Following the crash, the Public Transport Authority investigated whether Portuguese millipedes were the cause. When crushed by train wheels, the millipedes can make the track slippery. There had been previous cases on the Transperth network where trains had overrun platforms due to the millipedes. Later that week, the tracks around the station were sprayed with insecticide. Later, the Rail Tram and Bus Union said that it was unsafe shunting practise that caused the crash, not the millipedes. On 21 September 2014, an extension of the Joondalup line north to Butler railway station was opened. In 2017, the Mitchell Freeway was extended up to Hester Avenue north of the station, passing through Clarkson. The freeway's carriageways were built along both sides of Clarkson station. Services Clarkson station is served by Joondalup line trains operated by Transperth Train Operations, a division of the PTA. The line goes between Butler railway station and Elizabeth Quay railway station in the Perth central business district, continuing south from there as the Mandurah line. During the middle of peak hour, trains stop at the station every 10 minutes. At the start of peak hour, southbound trains stop at the station approximately every 5 minutes, with half of those services commencing at Clarkson station after exiting the Nowergup railway depot. At the end of peak hour, northbound trains stop at the station approximately every 5 minutes, with half of those services terminating at Clarkson station to enter the Nowergup railway depot. Services that terminate or start at Clarkson station are part of the K stopping pattern. During weekday between peak hour, on weekends and public holidays, trains stop at Clarkson station every 15 minutes. At night, trains are half-hourly or hourly. In the 2013–14 financial year, Clarkson station had 1,367,712 people board, the fifth most of the stations on the Joondalup line. Bus services are operated by Swan Transit under contract from the PTA. Six regular bus routes serve the station. Route 474 links to Joondalup railway station, passing through Kinross. Routes 480, 482, 483 and 484 link to Butler railway station, passing through suburbs including Butler, Jindalee, Merriwa, Mindarie, Quinns Rocks and Ridgewood. Route 481 goes northwest