Segmented? As in isolated rail triggers?.A relay's coil and it's points seldom share terminals. So you wire the points side like a switch (that has a motor 😜)
"how to" depends on some more variables and with the info listed, seems almost vague...like you already know how but want to doublecheck...but managed to leave something out...I just don't see where you.are.stumped.
Now the motor half is just two wires, one goes to the inside rail, the other goes to the isolated rail. Wheels then complete the circuit giving the isolated rail a connection to the outer rail via the wheels/axles
Relays have two value sets listed; You want a relay that uses low amps @ the track/constant voltage or varible( e.g. 0.25a @ 3v-12v means the relay triggers with as little as 3v thru 12v max(I'd look for one handling a 24vac max.
The point count, action type, and strength(amp/volt max) should handle the max load you use. They follow the labeling style of a a switch and may be momentary, latching, etc, or have multi poles or throws etc. (spst, spdt,etc)
