Hi Tim & welcome to the forum,
If the track is tinplate & has a series of studs in the centre of it then it is an AC set which cannot be used on a conventional controller. You will need one made by Marklin. The locomotive will (or should have) a sprung pick up skate between the running wheels, in the centre.
When you have the correct controller one wire will go to the running rails & the other to the centre studs.
Hope this helps.
If the track is tinplate & has a series of studs in the centre of it then it is an AC set which cannot be used on a conventional controller. You will need one made by Marklin. The locomotive will (or should have) a sprung pick up skate between the running wheels, in the centre.
When you have the correct controller one wire will go to the running rails & the other to the centre studs.
Hope this helps.