( Metal frame and mostly locomotive body.
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.
H Triple headlights that change over with the direction of travel.
j Built-in interior details.
T Märklin close couplers in standard pocket with pivot point.
U Märklin close couplers in standard pocket with guide mechanism.
3 Era 3
b Digital locomotives or digital device for the Märklin Digital System (Motorola format).