into SWT livery. 2008 The units received another refurbishment in 2008 at Wabtec Doncaster. CCTV and PIS (Passenger Information Systems) were installed, new seating was installed in first class and at the same time the units received a modified version of the SWT express livery (with orange doors as opposed to the red doors on Class 444 units) for compliance with disabled access regulations. Class 158 conversions Eight of TransPennine's surplus three-coach Class 158 units were refurbished to match SWT's existing Class 159 units at Wabtec Doncaster, and renumbered into Class 159 subclass /1. The first updated units were delivered to South West Trains in November 2006, and by May 2007 all of the new subclass were in service. The refurbishment included making the first-class accommodation area larger and completely refitting it, brighter interior lighting with new diffusers and the plating-over of the disused toilet in the MSO vehicle. The Class 159/1s have been fitted with retention toilets. Additional alterations include the installation of a Passenger information system (PIS) and CCTV as is fitted on the 159/0s. The converted units however retained their original Cummins NTA855-R1 engines, which produce less power than the R3 variants fitted to the Class 159/0 fleet. Fleet details Liveries Routes Served These trains serve the following routes: London Waterloo to Basingstoke, Salisbury and Exeter St Davids via Yeovil Junction London Waterloo & Salisbury to Yeovil Pen Mill (Via Westbury or Yeovil Junction) Notes References External links 159 159 Train-related introductions in 1993