A non-latching device like a momentary switch can be normally open (off) or normally closed (on) as a trigger to set off a sequence or change its progress.
A latching device like a NON-MOMENTARY toggle switch can be normally open (off) or closed (on). It can change how the sequence progresses or stop a sequence completely. But be careful as you can easily stop all sequences in an MP if you put the switch on and have the command in the wrong sequence location.
A block with gaps and a block detector (BD20) can be used as EITHER ONE, depending on whether your target is moving or stationary.
If you use the same locos for the same tasks permanently repetitively, you can also manipulate locomotive behavior with loco commands.
Writing out a logical flow chart with yes-or-no questions can be very helpful in converting the results you want to programming commands.
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