Multiple Dwellers training together in the same room decrease the training time for all Dwellers in the room.

The higher the SPECIAL stat of a Dweller is, the longer it takes to train them to the next level. The time it takes a dweller to improve varies depending on their level, the room size and level, and how many other dwellers are working on the same skill.

There is a Training Room for each one of the seven stats. Training rooms allows assigned dwellers to train and increase their SPECIAL stats over time. Both outcomes affect dweller happiness too, either positively or negatively. On failure, the room can either spontaneously erupt into flames or be attacked by mole rats or radroaches. By rushing production, players gain a monetary bonus and fast access to materials, but there is a percentage chance of failure. Production rooms may also be rushed in order to produce resources faster.

Production times are also modified by the room's size, level, and the working dweller's happiness. four dwellers with Strength 5 in a double-generator room are as productive as 2 dwellers with Strength 10 in the same room. production cycle time is dependent on the assigned dwellers' total level for the room's required SPECIAL skill. Production rooms produce the basic resources and medical items that to keep the Vault and its Dwellers going, each room regularly produces them in cycle over time as long as at least one dweller is assigned to operate it.

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