TOPS Numbering

In 1973 the introduction of TOPS gave the vehicles the following classifications:-

DMBS vehicles became Class 108/2
DMC(L) vehicles became Class 108/1
DTC(L) vehicles became Class 142
TBS(L) vehicles became Class 167
TS(L) vehicles became Class 161

Later all cars became simply Class 108

In 1983 to avoid duplication with loco numbers, DMU vehicles in the 50XXX and 56XXX number series were renumbered to the 53XXX and 54XXX series respectively.
Number   Type Seats   Formation   Weight   Cab Type   Diagram   Lot No. New Diagram
E50599 - 50619   DMBS 52   Power trailer   29 tons   1   543   30406 DQ212
E50620 - 50624   DMBS 52   3 car   29 tons   1   543   30406
M50625 - 50629   DMBS 52   Power trailer   29 tons   1   543   30407 DQ212
E50630 - 50641   DMC(L) 12/50   4 car   28 tons   1   544   30408 DP310
E50642 - 50646   DMC(L) 12/50   3 car   28 tons   1   544   30408 DP310
M50924 - 50935   DMBS 52   Power twin   29 tons   1   543   30460 DQ212
M50938 - 50987   DMBS 52   Power trailer   29 tons   1   543   30465 DQ212
M51416 - 51424   DMBS 52   Power trailer   29 tons   2   634   30498 DQ213
M51561 - 51572   DMC(L) 12/52   Power twin   28 tons   1   609   30461 DP311
M51901 - 51921   DMBS 52   Power trailer   29 tons   2   634   30601 DQ213
M51922 - 51950   DMBS 52   Power twin   29 tons   2   634   30601 DQ213
M52037 - 52065   DMC(L) 12/53   Power twin   28 tons   2   638   30660 DP312
E56190 - 56210   DTC(L) 12/53   Power trailer   21 tons   1   640   30409 DS310
M56211 - 56215   DTC(L) 12/53   Power trailer   21 tons   1   640   30410 DS310
M56221 - 56270   DTC(L) 12/53   Power trailer   21 tons   1   640   30466 DS310
M56271 - 56279   DTC(L) 12/53   Power trailer   22 tons   2   646   30499 DS311
M56484 - 56504   DTC(L) 12/53   Power trailer   22 tons   2   646   30602 DS311
E59245 - 59250   TBS(L) 50   4-car   23 tons       546   30412 DU201
E59380 - 59385   TS(L) 68   4-car   22 tons       547   30411 DT205
E59386 - 59390   TS(L) 68   3-car   23 tons       545   30493 DT206
Cab types: 1 - two character box under windscreen, 2 - four character box on roof dome

Original Set Formations

Power/trailers (total 106)    
1958 - DMBS E50599 - 50619 DTC E56190 - 56210
  DMBS M50625 - 50629 DTC M56211 - 56215
1959 - DMBS M50938 - 50987 DTC M56221 - 56270
1960 - DMBS M51416 - 51424 DTC M56271 - 56279
  DMBS M51901 - 51921 DTC M56484 - 56504
         
Power twins (total 41)    
1959 DMBS M50924 - 50935 DMC M51561 - 51572
1960 DMBS M51922 - 51950 DMC M52037 - 52065
         
3 car sets (total 5)    
1958 DMBS E50620 - 50624 TSL E59386 - 59390 DMC E50642 - 50646
             
4 car sets (total 6)        
1958 DMC E50630 - 50641 TBS E59245 - 59250 TSL E59380 - 59385

In later years, 4-car sets were reformed into 3-car units by removing the TS vehicle, the TS was then available to be inserted in a power twin. This was done during the 1980s producing 3-car sets for LMR depots such as Buxton (BX) and Chester (CH).