The class were designed to be lightweight to allow for good acceleration. None were selected for refurbishment and withdrawals started in 1969. The last passenger car was withdrawn from service in 1988. Under initial classification 1973, the DTCLs became class 143 but were later reclassified as class 100. DTCL 56111 was used as a training aid by the
Ministry of Defence until 1985. Two sets entered Departmental service: DMBS 51122 and DTCL 56300 became ADB975664 and ADB975637 for use as the "Stourton Saloon" – the
Eastern Region General Manager's saloon – for which the class gained a small amount of "fame"; this pair were scrapped, in 1990, at Mayer-Newman's yard at
Snailwell, in
Cambridgeshire. The other pair were ADB975349 and ADB975539 (formerly DMBS 51116 and DTCL 56101) and were used as the Eastern Region inspection saloon, until being scrapped in 1993. DTCL 56106 was also taken into Departmental service, becoming ADB977191, part of the Crewe Works test train. This vehicle survived the longest time on the national network, having been stored for some years in Basford Hall yard, out of use. The final public appearance of ADB977191 was at the Crewe Works Open Day, on 21 May 2000, following which it was scrapped. ==Preservation==