I bought a pack of them (4) the last time I ordered track just to see what they looked like.... for possible use for blocks.
I fitted the B'Man connector to one... it fit ok.... but expensive way to go.... spade connectors should work just fine... if you are making permanent connections a drop of solder should do the trick... I would use heat sink.
Your response to my radius question indicated you are considering joining two main lines.... I am thinking about doing similar effort.... using blocks of course (don't want DCC) and want automatic ops.
You mentioned different guage wire... you concerned with amps or voltage drop?
yarm35