Do you have a question about the marklin 73400 and is the answer not in the manual?
Instructions for detaching the car body from the chassis.
Steps for inserting the grounding spring and shortening it if necessary.
Guidance on clipping the pickup shoe onto the assembly.
Inserting the circuit board and considerations for low or high interior configurations.
Procedure for plugging in the electrical wires, noting quantities for different car types.
Instructions for placing the car body back onto the chassis.