DCC accessories are used for several purposes: to change points; to control signals; to turn on or off scenery accessories; and for special functions. This page describes the range of numbers used.

1-99 Points
201-399 Signals
401-500 Turntable (401: normal DCC address; 451: Marklin address)
501-700 Scenery
901-999 special functions
901 DTM30 interlock for Eastleigh depot
911 DTM30 interlock for Portsmouth station
912 DTM30 interlock forPortsmouth Approach
913 DTM30 interlock for Portsmouth container depot and engine shed
921 DTM30 interlock for Clanfield
922 Activated when crossing barriers are down to allow signals to go green