Class 317: After the PEP-derived aluminium stock, the next series of EMUs were based on steel Mark III coaching stock, forming EMU classes 317-322, 325, 455 and 456, and DMU class 150. The 317s were the first, with 48 class 317/1s built at York from 1981 for the St Pancras - Bedford 'Bedpan' electrification, but not entering service until 1983 because of dispute about Driver Only Operation. 24 class 317/2s followed from 1985, to a tidier design, for outer suburban services from Kings Cross. The 317/1s were displaced from the MML by the Thamelink scheme from 1987 and transferred to the WCML, but their stay there was short (replaced by class 321/4s) and from 1989 they moved to the West Anglia and Great Northern routes, joining the 317/2s - with the fleet passing to the WAGN franchise at privatisation. The story from this point is complex, with various transfers and renumberings. A number of the 317/1s saw hire to LTS between 1996 and 2000. Units were also hired to Thameslink for Moorgate services. WAGN refurbished their 317/2s as 317/6s from 1998, appearing in a new livery. 317/1s wore WAGN purple. In 2000, 9 class 317/1s were refurbished as class 317/7 for Stansted Express services replacing the dedicated class 322s. 2004 saw the WAGN franchise split into Anglia, and GN which would later be merged with Thameslink (FCC). In 2006, further class 317/1 rebuilds became 317/8. The 317/7 and 317/8s would later work for London Overground. Greater Anglia operates the 317/6s, and some refurbished 317/1s as 317/5. GN operated the last class 317/1s retaining their original numbers.
This shot shows 317/1 317317 arriving at Kings Cross.