Silent Running

Silent Running is a perk in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, and Fallout Tactics.

Fallout, Fallout 2 and Fallout Tactics
With this perk, one can use their Sneak skill and run at the same time.

Fallout 3
With this perk, one gains +10 Sneak, and running no longer factors into a successful sneak attempt.

This perk drastically increases the ability to crouch-run through buildings to achieve Sneak Attack Criticals. Together with the Chinese stealth armor, the player character is virtually invisible to non-player characters, even when using the Pip-Boy 3000's light.

Fallout: New Vegas

 * With this perk, running no longer factors into a successful sneak attempt.
 * Melee or unarmed fighters that rely on sneak attack criticals can also benefit from the perk alongside Travel Light, Implant M-5 and Tunnel Runner, allowing one to close the distance quickly while remaining silent to achieve a Sneak Attack Critical.

Fallout 4
The effects of this perk are found in the fourth rank of the Sneak perk.

Behind the scenes

 * "Silent running" is a mode of operation for submarines where all unnecessary systems are shut down, propeller speed is reduced and the crew is ordered to remain as quiet as possible, all in order to reduce the chances of being detected by passive sonar.
 * It is also a reference to the 1972 film Silent Running, which was set against a post-apocalyptic sci-fi backdrop.

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