Second class vehicles are in 2xx series and composite vehicles in 3xx series.
It can be assumed that DT 304 would have been Class 116 TCs, which were then downgraded to 2nd class only becoming DT 215.
DT 201


Class 101
TS
Diagram BR 622
DT 202


Class 101, 111
TS
Diagram BR 623
DT 203


Class 104
TS
Diagram BR 583
DT 204


Class 107
TS
Diagram BR 647
DT 205


Class 108
TS
Diagram BR 547
DT 206


Class 108
TS
Diagram BR 545
DT 207


Class 110
TS
Diagram BR 648
DT 208


Class 115, 127
TS
Diagram BR 590
DT 209


Class 116
TS
Diagram BR 856B
DT 210


Class 120
TS
Diagram BR 572
DT 211


Class 123
TS
Diagram BR 568
DT 212


Class 124
TS
Diagram BR 573
DT 214


Class 127
TS
Diagram BR 589
DT 215


Class 116
TS
Diagram BR 555
DT 216


Class 119
TS
Diagram BR 542
DT 217


Class 120
TS
Diagram BR 561
DT 218


Class 104
TS
Diagram BR 582
DT 219


Class 116
TS
Diagram BR 855B
DT 220


Class 101
TS
Diagram BR 624
DT 221


Class 111
TS
Diagram BR 625
DT 223


Class 126
TS
Diagram BR 571
DT 224


Class 126
TS
Diagram BR 857
DT 225


Class 101
TS
Diagram BR 668
DT 226


Class 127
TS
Diagram BR 589
DT 227


Class 115
TS
Diagram BR 599
DT 228


Class 101
TS
Diagrams BR 622,
BR 623 &
BR 624
DT 229


Class 115, 127
TS
Diagram BR 590
DT 301


Class 101
TC
Diagram BR 624
DT 302


Class 104
TC
Diagram BR 582
DT 303


Class 115
TC
Diagram BR 599
DT 305


Class 117, 118
TC
Diagram BR 851
DT 306


Class 123
TC
Diagram BR 567
DT 307


Class 115
TC
Diagram BR 599