Hi Frank: I have four mail lines and each main line has it's own Lionel Brick 180 Watt Powerhouse, the new item number is 6-2293. Found on page 48, Lionel Track & Power Catalog 2016-2017. I have older models. If you are going to go with new locomotives, purchase the LionChief Plus Locos, with Blue Tooth.
I also have six video on my YouTube Channel, you may find these helpful.
https://www.youtube.com/watch?v=vbWfacp3U3Q
https://www.youtube.com/watch?v=X1IqzW9IL7U&t=4s
https://www.youtube.com/watch?v=Hw2_EjBif4U
https://www.youtube.com/watch?v=6pYAU2xJlDg&t=1s
https://www.youtube.com/watch?v=lHiClJLFCLk
https://www.youtube.com/watch?v=72_RH1wwp2w
Gary: Good Luck