Thanks to the efforts of the numerous, dedicated enthusiasts there are more than 300 preserved heritage mainline locomotives in the UK. These people work on a volunteer basis and devote enormous amounts of time and effort to help preserve these classic machines.

These locomotives can be seen at the many private railways across the country. They are in various states of repair from operational and certified for use on the national mainline to others requiring years of restoration work. Those fitted with the mandatory electronic equipment to allow for their operation on the national mainline are sometimes used for railtours and land cruises for a variety of train operators.
40012 Aureol40013 Andania40106401354014550007 Sir Edward Elgar50008 Thunderer50015 Valiant50019 Ramillies50026 Indomitable50027 Lion50031 Hood50035 Ark Royal50042 Triumph50044 Exeter50049 DefianceDP1 DELTIC55002 The King's Own Yorkshire Light Infantry55009 Alycidon55015 Tulyar55016 Gordon Highlander55019 Royal Highland Fusilier55022 Royal Scots GreyOther Mainline BR ClassesOther Non-Mainline BR ClassesPower Units