A number of people have asked about the renumbering and modification of South West Trains Class 158s.

At the time of reallocation to Salisbury depot it was agreed with rolling stock library to renumber the ad-hoc units in a new number series to immediately identify the SWT sets. The block from 158880 upwards was selected and thus the carriage numbers no longer reflect the set number. In the past the last two digits of the set number and vehicle number have matched.

The sets have come from various operators and part of the deal with SWT was for the units to be refurbished and repainted into standard SWT main line livery at Wabtec Doncaster. The sets are presently passing through the works and a few unrefurbished sets in previous operator liveries remain at Salisbury, all sets have already been renumbered.

SWT Class 158s as at 11 June 2007
158880 modified from 158737 vehicles 52737, 57737 (ex TransPennine) available for service
158881 modified from 158742 vehicles 52742, 57742 (ex TransPennine) presently at Wabtec Doncaster
158882 modified from 158743 vehicles 52743, 57743 (ex TransPennine) presently at Wabtec Doncaster
158883 modified from 158744 vehicles 52744, 57744 (ex Trans Pennine) presently at Wabtec Doncaster
158884 modified from 158772 vehicles 52772, 57772 (ex Trans Pennine) presently at Wabtec Doncaster
158885 modified from 158775 vehicles 52775, 57775 (ex Trans Pennine) available for service
158886 modified from 158779 vehicles 52779, 57779 (ex TransPennine) available for service
158887 modified from 158781 vehicles 52781, 57781 (ex Trans Pennine) awaiting refurbishment
158888 modified from 158802 vehicles 52802, 57802 (ex TransPennine, originally 3-car set) available for service
158889 modified from 158808 vehicles 52808, 57808 (ex TransPennine, originally 3-car set) presently at Wabtec Doncaster
158890 modified from 158814 vehicles 52814, 57814 (ex TransPennine, originally 3-car set) awaiting refurbishment (in use)

For completeness the Class 159 upgrade from Class 158s recently undertaken at Wabtec Doncaster see the following formations.

SWT Class 159/1s as at 11 June 2007
159101 - 52800, 58717, 57800 modified from 158800
159102 - 52803, 58703, 57803 modified from 158803
159103 - 52804, 58704, 57804 modified from 158804
159104 - 52805, 58705, 57805 modified from 158805
159105 - 52811, 58707, 57807 modified from 158807, with 52811 from set 158811
159106 - 52809, 58709, 57809 modified from 158809
159107 - 52801, 58711, 57811 modified from 158811, with 52801 from set 158801
159108 - 52807, 58701, 57801 modified from 158801, with 52807 from set 158807