My grandson has a 0-8-0 RTR Set with Bluetooth that runs off a wall wart, and I got him a conventional transformer and a conventional trolley to use on his Fastrack. He may want to run other conventional locos on the Fastrack layout as well.
Rather than get a different terminal track I wanted to make a barrel connector cable with spade terminals at the other end (to go to the conventional transformer). Variable to center rail.
I know the barrel connector is center positive. I don't have it at my house (it is at my grandson's house) so I was wondering if anyone knows the size of the barrel connector that fits (or the barrel size for the wall warts that come with the set)?