( Metal frame and mostly locomotive body.
c Digital locomotives with high-efficiency propulsion. Maximum speed and acceleration / delay are adjustable. Special motor with electronically enhanced load compensation or a compact bellshaped armature. Can be operated with Märklin transformers, in the Märklin Delta system or in the Märklin Digital system. One controllable auxiliary function (function), when the locomotive is being run in the Digital system.
d Digital decoder with additional, digitally controlled functions (f1, f2, f3 or f4) when operated with the 6021 Control Unit. The functions present depend on how the locomotive is equipped. Standard function (function) active during conventional operation.
a Universal locomotive with Delta electronic circuit. Can be operated with Märklin transformers, in the Märklin Delta system or in the Märklin Digital system (Motorola format).
H Triple headlights that change over with the direction of travel.
U Märklin close couplers in standard pocket with guide mechanism.
3 Era 3