Isolator switch

If you use the Massoth insulated rail-clamps, they come with 'solder tags'. - ring terminals you solder a wire to.
These can be done away from the track, so easier to work with.

Alternatively, you can get crimp-on ring terminals, but there is a knack to fitting / using these, as well.,

Whatever switches you get, the more protection you can give them, the better..
You can get 'chunky' switches, where the connectors are either push-on blades (we call them 'Lu-Car') or even a screw you can fit a ring terminal to..

It all depends on what you can get locally, and how much you are prepared to spend.

PhilP
I've actually bought both recently and trying to decide which set to use. My purpose is slightly different, my plan is to add them to each junction box on the bus wire for the 12v and track power. The intention is to allow me to isolate section for fault finding. Both sets of DPDT. The first are rated for 125V 5A and the second are 125V 20A (very chunky!) Not sure if I can get away with the first set as they're smaller...
 
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