This set was produced in 1992 and 1993 as a limited train set for Switzerland.
Locomotive SBB Em3/:
This model is version 3 of Märklin 3088
The freight cars:
This car is version 6 of Märklin 4410
This car is version 7 of Märklin 4410
This car is version 4 of Märklin 4411.
It has a flashing rear red light.
I have converted the train set to digital operation, see 2847