Class 117 (52 vehicles)
Rather suprisingly these suburban units have survived into preservation in remarkable numbers, and by the 2010's it had become the largest DMU class in preservation with over 50 vehicles. Built by Pressed Steel for BR, these vehicles were originally three car sets, and examples of all three types are represented. Several sets still operate "as intended" as 3-car sets. Their survival is mainly due to extensive use by Network SouthEast and Scotrail, which kept them in service on the national network longer than most DMUs, in a similar story to the class 101s.
In preservation, few have received major work, with most being launched straight into traffic with little attention required. However this trend is slowly reversing with some vehicles undergoing overhaul as wear and tear takes hold. Most have now lost their late BR colours, returning to green (and in some cases blue or blue/grey).
A notable set is the Swanage Railway's 3-car unit, which was refurbished at a cost of over £1 million and derogated to run on Network Rail between Worgret Junction and Wareham. It is (to date) the most expensive first generation restoration and the set now regularly runs mainline services along this short section as part of a road traffic busting summer Swanage-Wareham service.
Although not strictly the preservation of whole Class 117 vehicles, sections of 51346 & 51366 also survive.
Now Scrapped