2xx series is for second class vehicles and 3xx for composite vehicles.
201-208 seem to be vehicles that were always second class. 209 upwards are vehicles that were originally composite, now downgraded to second class only. The exception to this rule is 220/1, these are gangwayed versions of ungangwayed 201/2.
DP 201


Class 116
DMS
Diagram BR 554
DP 202


Class 117
DMS
Diagram BR 535
DP 203


Class 119
DMS
Diagram BR 541
DP 204


Class 120
DMS
Diagram BR 586
DP 205


Class 120
DMS
Diagram BR 637
DP 206


Class 123
DMS
Diagram BR 574
DP 208


Class 126
DMS
Diagram BR 551
DP 209


Class 104
DMS
Diagram BR 558
DP 210


Class 101
DMS
Diagram BR 621
DP 211


Class 105
DMS
Diagram BR 529
DP 212


Class 101
DMS
Diagram BR 618
DP 213


Class 101
DMS
Diagram BR 619
DP 214


Class 101
DMS
Diagram BR 620
DP 215


Class 107
DMS
Diagram BR 649
DP 216


Class 101
DMS
Diagram BR 690
DP 217


Class 104
DMS
Diagram BR 580
DP 218


Class 104
DMS
Diagram BR 559
DP 219


Class 108
DMS
Diagram BR 544
DP 220


Class 116
DMS
Diagram BR 854c
DP 221


Class 117/118
DMS
Diagram BR 852
DP 226


Class 108
DMS
Diagram BR 609
DP 227


Class 108
DMS
Diagram BR 638
DP 301


Class 101
DMC
Diagram BR 618
DP 302


Class 101
DMC
Diagram BR 619
DP 303


Class 101
DMC
Diagram BR 620
DP 304


Class 101
DMC
Diagram BR 621
DP 305


Class 104
DMC
Diagram BR 558
DP 306


Class 104
DMC
Diagram BR 559
DP 307


Class 104
DMC
Diagram BR 580
DP 308


Class 105
DMC
Diagram BR 529
DP 310


Class 108
DMC
Diagram BR 544
DP 311


Class 108
DMC
Diagram BR 609
DP 312


Class 108
DMC
Diagram BR 638
DP 313


Class 110
DMC
Diagram BR 563
DP 314


Class 111
DMC
Diagram BR 616
DP 315


Class 111
DMC
Diagram BR 617
DP 316


Class 120
DMC
Diagram BR 577
DP 317


Class 101
DMC
Diagram BR 621