You should know that there are two versions of the Command Base. The first one, released before the year 2000, accepts signals around 26 MHz and transmits them to the track at around 450 kHz, and is black. The second Command Base, I think its called Command Base 1L, accepts signals in the 2400 MHz band and transmits to the track at the same 450 kHz, and is blue.
The black one needs a gray CAB-1 remote which has a long antenna (the handheld, not the base). The blue base needs a blue CAB-1L remote and the antenna is built in. They do not mix. For either one, you can buy more remotes.
There may be differences in the voltage levels of the 9-pin serial port connector, should not matter to you.
I happen to have both, never got around to selling the first black one. So I went digging in storage boxes, found the base, and of course could not find the transformer/wall wart. I finally found it powering up a Lionel switch controller on my floor layout. I hooked up the old Command Base and the green LED came on, put batteries in a gray CAB-1, spun the dial, and the red LED flickered, indicating it is receiving commands. So I took a picture of the label ...
I have searched on the internet, and each transformer that I have found that claims to be a replacement does not have the third grounding plug, so I will not post any of these. Giving up for now.
Third edit: In CAPPilot's diagram, it would help with the wall wart for the Command Base had the third prong.
