BR had two rail mounted trench digging machines. Both were based at Radyr but used throughout the country. They retained earlier numbers.
DB965168 was built by Hunslet no. 6056 in 1962 and reported scrapped March 1995. Film of it working - possibly a trial when new from 1.06 https://youtu.be/NP6Dt32Pg_4
DW100701 is reported converted 1959 and scrapped July 1987
© Paul Bartlett's Photographs