They only built 15 DTCL driving trailers (10 midland and 5 eastern) with the last on be withdrawn in November 1989 from old oak common. With 2 more DTCL until December 1992 in departmental use. The ones that got network south east was 8 DMBS and 2 TCL. Strange still that class 104 got network southeast even the person in charge of network south east didn't know when asked a couple of years ago why they did them and not other units like class 101/8 which were better.