I use SPST toggles to activate my Tortoise since they stall under power. I use the directional lean of the toggle handle within the track schematic to indicate the "thru" or "out" position of the turnout. Simple and quick read of turnout positioning.
I noticed you had a similar post earlier that "disappeared" before I replied above, and was wondering if you really meant to write SPST [ = either 'on' or 'off' ] -- or if you use two SPST's per turnout ??? I do the same as far as control position = turnout position [ well, usually, and with 'known exceptions' such as dual controlled turnouts ] -- but they are SPDT, or DPDT where power routing is also accomplished.
SZ