Spoiler

If chips or HQ are moved in/out of a province that Rail War was used on during the same turn, will the chips or HQ still be moved?

Yes, chip movements will be processed before Subversions.

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I have a province that had a Rail War placed on it, which made it lose communication with my HQ. Will other provinces that are only connected to my HQ by this province also lose communication with HQ?

Yes, the Rail War completely cuts off communication, including to provinces beyond it if they are not connected by another route.

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I tried Provocation on a province, but it failed. Can I try it again on that province?

Yes, you can try any of the Subversion tactics on the same province again, however the chance of success each time a Subversion tactic is tried on a particular province decreases with each failed attempt.

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Can I try two different subversions on the same province on the same turn?

No, only one Subversion may be used per turn.

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Can I use multiple subversions on the same turn if applied to different provinces?

No, only one Subversion may be used per turn.

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Does a clan need to be on the map to perform these special operations?

Yes, a clan must be on the map and have its Headquarters placed in order to execute these operations.

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Can subversion be performed on any enemy territory, or only adjacent territories to your holdings?

Any.

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Can multiple clans throw subversions at a common enemy, have them succeed, and lock down all enemy chip movements?

Yes, however only one Subversion can be successful per province, and the chance of success decreases with each failure.

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Even if you increase the cool down what is to stop multiple groups from perma destroying the hq?

A Clan is able to greatly reduce the Subversion's chance of success by defeating enemy spies and also keeping a province's chance of revolt low.