Waterloo, as well as on some Central Trains services to and along the Cambrian Line. Successor companies Wales & Borders (2001) and Arriva Trains Wales (2003) continued to use this type of unit on similar workings, with a total allocation of 40 units also allowing Cambrian Line services to become entirely Class 158-operated. By the end of 2006, a total of 16 units (158815-158817 and 158842-158854) had returned to the leasing company, as Arriva gained exclusive use of the entire Class 175 Coradia fleet which had previously been shared with other train operators. The remaining 24-strong Class 158 Express Sprinter fleet became permanently based at a purpose-built depot in Machynlleth during 2007. Despite initial problems in retro-fitting the necessary 'glass cockpit'-style driver controls, Arriva's Class 158 Express Sprinter units became the first fleet in the UK to be equipped for regular use with the ETCS Level 2 signalling system. Commercial operation under ETCS started on 28 March 2011. Accordingly, the units operate all Cambrian Line services between Mid Wales and Birmingham, as well as supplementing the Class 175 Coradia units on other long-distance routes. During 2009, Arriva also proposed using the fleet to provide a direct service between and London, although this proposal was later rejected by the Office of Rail Regulation. Between December 2010 and October 2012, there was a comprehensive refurbishment of the ATW Class 158 fleet, during which almost the entirety of the interiors was replaced with 'as new' fittings and fixtured. This work, which was funded by the Welsh Assembly Government at a cost of £7.5m, included both interior and exterior repainting, the installation of replacement seating, wall coverings, carpets, lighting, luggage racks and toilet fittings. A passenger information system was also fitted, while selected seats gained at-seat power sockets for mobile phones and laptops. Prior to the early 2010s refurbishment, the fleet had been subject to only minor attention to its interior since a refit by Wales & West during the late 1990s (little more than the fabric on the older seats changed and CCTV fitted) as well as having been only partially repainted into Arriva colours externally. The door controls and exterior destination displays were one of the few elements to be replaced prior to this refurbishment work. During 2017, WiFi equipment was fitted fleetwide. In June of the following year, the Class 158s were progressively modified for conformance with the Persons with Reduced