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
The perk is a reference to the 1972 film Silent Running, which was set against a post-apocalyptic sci-fi backdrop.

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