Photo info:
This post depicts two Great Western Railway Class 158 Diesel Multiple Units that have been recently reformed into 2-car units.
The units are 158747 and 158750, which haven't been 2-car units since around 2008, and the location is Cardiff Central railway station.
This is the first time these units have worn GWR Green livery as 2-car units, as when they were last 2-car units they were wearing First Great Western livery.
The top photo focuses on 158747, the middle photo focuses on 158750 and the bottom photo shows the whole train of the two units in multi with 158747 in the foreground.
A 2-car Class 175 Diesel Multiple Unit is right behind and one of the remaining GWR 3-car "hybrid" 158s is just out of shot to the right in the middle photo.
158747-158751 info:
Units 158747-158751 are significant for being the only five 158s of the original 182-unit Class 158 build that were operated by InterCity rather than Regional Railways in British Rail days, and are also the only 158s to have been operated day-to-day by Virgin Rail Group in the early privatisation days, as the only units in the mostly loco-hauled inherited fleet Virgin CrossCountry used from 1997 until the early 2000s and Voyager introduction.
The current operator Great Western Railway (formerly First Great Western) had reformed their 18 2-car 158s, including 158747-158751, into 12 3-car "hybrid" units around 10 years ago. Recently, they've been reforming them back into 2-car units.