with BSI couplers and compatible coupler electrical wiring; these are Classes 142, 143, 144, 150, 155, 156, 158, 159, 170 and 172. Gangway connections are provided at either end to allow passengers and staff to walk between units working in multiple, in-class as well as 150/2, 155, 156, 158 and 159. The maximum speed of was unchanged. Operations Current operations Wales & Borders Transport for Wales Rail has a fleet of 26 Class 153s. They are normally used on rural branch lines – such as the Heart of Wales Line from to and on local stopping services from to via – but are also used on some mainline services. One is used daily on the short Cardiff Queen Street to Cardiff Bay shuttle. Following a timetable change in December 2006, Arriva Trains Wales had lost three of its then-11 Class 153 units, leaving it with eight. Two were transferred to East Midlands Trains with the other going to First Great Western. In October 2018 all eight passed with the franchise to Transport for Wales (KeolisAmey Wales), who acquired a further five from Great Western Railway in April 2019, five from Abellio Greater Anglia in December 2019, four from East Midlands Railway in January 2020 and another two from EMR in November 2020, which brought the total number up to 24 until a further two units were acquired. As at February 2020, Transport for Wales was the only train operating company to have modified 153s to comply with the requirements of the Persons with Reduced Mobility Technical Specification for Interoperability (PRM-TSI), which came into effect on 1 January 2020. In June 2021, the new state-owned Transport for Wales Rail purchased eight outright for continued use on the Heart of Wales line after plans to replace them with Class 170 units were cancelled. In July 2022, the refurbishment of the 26 units was completed. Scotland In 2019/2020, five former GWR 153s moved from Northern to Abellio ScotRail for use on West Highland Line services between Glasgow and , in conjunction with ScotRail's existing fleet. The first refurbished carriage was unveiled in late 2020. The trains have also been refurbished inside providing free wi-fi, plug and USB sockets, and maps of the West Highland Line on the tables. ScotRail describe the service offering as Highland Explorer and charge a £10 upgrade fee for passengers using it. Due to a local agreement with driver's