Class 97

The Class 97s where departmental stock converted from regular stock or perpus built locomotives including the Class 97/6.

Regular Class 97s include:
 * 97020 - Built by Ruston & Hornsby in January 1957 with the serial number 408493, this 0-4-0 shunter was ordered specifically for departmental use by the Signalling & Telecommunications department of the Western region at Reading Signal Works. The transmission was diesel mechanical, although the wheels were chain driven from the gearbox and the loco was rated at 88 bhp (66 kW) for a weight of only 17 tons. Tractive effort was a maximum of 9,500 lbf (42,000 N). Delivered to the WR with the number 20 it was renumbered to 97020 in May 1980. However withdrawal came in April 1981 and it was scrapped on site in August 1982 by Cartwrights of Tipton.
 * 97800 - This locomotive was converted from a Class 08 locomotive 08600 in 1979 for use as a shunter at Slade Green Depot. It was named Ivor, and was later painted in Network SouthEast livery. In 1990, this locomotive was returned to capital stock with its original number.
 * 97801 - This locomotive was converted from a Class 08 locomotive in 1978 for use by the Research Department at Derby. It was originally numbered RDB968020, but was given a Class 97 number in 1979. It was named 'Pluto', used to evaluate a remote control system and withdrawn in 1981.
 * 97802 - This locomotive was converted from a Class 08 locomotive in 1979 for use at Polmadie depot. It was used for only a year in this role before withdrawal.
 * 97803 - This locomotive was converted from British Rail's last remaining Class 05 locomotive, no. 05001. It was used on the Isle of Wight railway system, based at Ryde, and was rebuilt with a lower cab to allow it to be used through the restricted-height Ryde Tunnel. It was withdrawn as non-standard, and was replaced by no. 97805.
 * 97804 - This locomotive was used at Reading Signal Works following the withdrawal of 97020, and was converted from a Class 06 locomotive, no. 06003. It was made redundant when the works closed in 1984, and was later preserved. It is now the sole-surviving Class 06 locomotive.
 * 97805 - This locomotive was converted from a Class 03 locomotive to replace the non-standard 97803. It was later renumbered back to its original number of 03079, and remained in use on the Isle of Wight until 1996.
 * 97806 - This locomotive was a former Class 09 locomotive, which was allocated to Sudbrook for exclusive use on the Severn Tunnel emergency train. The train has been replaced by former Class 121 diesel units, and 97806 returned to capital stock with its original number, 09017.
 * 97807 - This locomotive was converted from a Class 03 to assist 97805 on the Isle of Wight. It was later renumbered back to its original number of 03179, and remained in use on the Isle of Wight until 1996.