, since Class 46 locomotives are usually restricted to . 97403–97404 These two locomotives were converted from Class 46 locomotives (97403 was 46035 and 97404 was 46045). They were operated by the Railway Technical Centre at Derby. 97403 was named "Ixion", and was used to evaluate wheelslip. It was painted in RTC's red/blue livery. 97404 was used as a source of spare parts. Both locomotives have been preserved. 97405–97408 These four locomotives were renumbered from Class 40 locomotives, which had all recently been withdrawn from normal traffic. In 1985, they were returned to use and employed on engineering trains around Crewe, and restricted to a maximum speed of . A major scheme was in progress to remodel the railways around Crewe railway station. After these duties finished, the four Class 40s continued in departmental service working ballast, freight and occasional parcels trains until finally being withdrawn in 1986/87. However, three of the four were later preserved. 97405 – Formerly 40060, the final Class 40 in departmental service and withdrawn in March 1987, unofficially named Ancient Mariner, this locomotive was cut up at Vic Berry in March 1988. 97406 – Formerly 40135, later preserved at the East Lancashire Railway. 97407 – Formerly 40012 Aureol, later preserved at the Midland Railway – Butterley. 97408 – Formerly 40118, later preserved at Tyseley Locomotive Works. 97409–97413 These five locomotives were renumbered from Class 45 'Peak' locomotives. They were used on infrastructure trains in association with major engineering works. All five locomotives were withdrawn by 1988, and have all since been scrapped. 97472, 97480, 97545 and 97561 These four locomotives were converted from Class 47 locomotives in 1989, and were used to haul test-trains throughout the country. Number 97561 was repainted in maroon livery and named "Midland Counties Railway" to commemorate the railway's 150th anniversary. Three of the four locomotives were later renumbered into the range 47971–973, but continued to be employed hauling test-trains. They were later joined by 47974–976 and 47981. The fourth locomotive, no. 97472, was renumbered back to number 47472, and shortly after was withdrawn from traffic due to fire damage. 97650–97654 These shunting locomotives were purpose-built by Ruston & Hornsby at Lincoln in 1953 (97650) or 1959 (rest). 97701–97710 These battery locomotives were converted from the driving motor cars from former Class 501 electric multiple units, and usually worked in pairs. They were modified by the removal of the seats, sealing