I have worked with these switches for a PLC project and yes you do only want to use a momentary toggle switch. Under normal conditions, once the switch is thrown and reaches the limit switch, the motor shuts off. If something jams the switch, then the motor will be on and probably will burn out.
Holding either Through or Turnout on would also prevent the non-derail feature from working. There are plenty of momentary toggle switches out there to use which would work without having and issues.
In my case, I used SPDT relays to control the switch positions. Since relays are a constant on condition, I used one relay to connect the others to the track common. I set my three relays to what I want as far as the switches, and the fourth relay closes for 1 second to enable the switch throw.
Attached also is the wires that control the anti-derail feature. If you pull the blue and green wire as indicated, it will disable this feature.
Mike
