> For the complete documentation index, see [llms.txt](https://peasant-foundry.gitbook.io/mechtrauma/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://peasant-foundry.gitbook.io/mechtrauma/items/machines/powertrain.md).

# Powertrain

The Powertrain is Mechtrauma's replacement for [Engines](https://barotraumagame.com/wiki/Engines). A Powertrain is not a single Machine, but is a collection of them. It is comprised of a Steam Boiler, a Steam Turbine, and a Reduction Gear. The Steam Boiler takes in standard Power from a [Generator](/mechtrauma/items/machines/diesel-generators.md), [Nuclear Reactor](https://barotraumagame.com/wiki/Nuclear_Reactor), or [Battery Bank](/mechtrauma/items/machines/battery-bank.md)/[Battery](https://barotraumagame.com/wiki/Battery) and converts it into Steam. The Steam Turbine takes in this Steam, and converts it to Kinetic Force. The Reduction Gear reduces the speed of the Kinetic Force and increases the torque so that it can spin the submarine's propeller allowing for horizontal movement.

![](https://4058979394-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXI5pJl21HS1hRE4wDt59%2Fuploads%2F7wMzbEfdi6BNIa0DiXJx%2Fboiler.png?alt=media\&token=4436c597-0e5e-4d6e-97be-120281142173)![](https://4058979394-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXI5pJl21HS1hRE4wDt59%2Fuploads%2Fgvor91Fvq08F0mjrxXQY%2Fsteam_turbine.png?alt=media\&token=ff6bc4ab-d931-428b-8e7a-e204bc5e1d8b)

#### Steam Boiler

The Steam Boiler is an Installation which accepts normal Power and converts it into Steam. Currently, Steam is transferred through [Wiring](https://barotraumagame.com/wiki/Wiring), but there are plans for this to be transferred through Pipes in the future. the STEAM\_OUT pin should only be wired into the STEAM\_IN pin of a Steam Boiler otherwise it will do nothing. It cannot be transferred through relay or other components. There is also a horizontal variant.

**Advanced Steam Boiler**

There is also an Advanced Steam Boiler in development. It will function similarly to a battery in some ways. While it is running, it generates and fills up with [Steam](/mechtrauma/dead-links/power-types.md). As it powers a Steam Turbine the amount stored will go down. The amount of [Steam](/mechtrauma/dead-links/power-types.md) in it can get too high, in which case some yet to be implemented pressure relief method will need to be enacted. It will likely be a [Steam Valve](/mechtrauma/dead-links/steam-valve.md) which must be opened to release the pressure lest the Advanced Steam Boiler explode releasing dangerous Steam into the area around it. A Steam Regulator is also necessary. The STEAM\_OUT pin should go into this as it prevents too much Steam from passing onto its output. Currently it looks identical to a regular Steam Boiler.

#### Steam Turbine

![](https://4058979394-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXI5pJl21HS1hRE4wDt59%2Fuploads%2Fgvor91Fvq08F0mjrxXQY%2Fsteam_turbine.png?alt=media\&token=ff6bc4ab-d931-428b-8e7a-e204bc5e1d8b)

The Steam Turbine is a [Machine](/mechtrauma/items/machines.md) which converts [Steam Power](/mechtrauma/dead-links/power-types.md) to [Kinetic Force](/mechtrauma/dead-links/power-types.md). It outputs through KINETIC\_OUT, and should be inputted into the KINETIC\_IN pin on a Reduction Gear. Despite being a type of [Power](/mechtrauma/dead-links/power-types.md), it cannot be transferred through a relay or other component.

#### Reduction Gear

![](https://4058979394-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXI5pJl21HS1hRE4wDt59%2Fuploads%2FybnoRpsh6bxdGyeFzyFF%2FReduction_Gear.png?alt=media\&token=a76fe61f-aac7-444f-b7c8-02ac7bbace5e)![](https://4058979394-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXI5pJl21HS1hRE4wDt59%2Fuploads%2Ff6UHG6c0DLwMvFDgeEg3%2FReduction_Gearv2.png?alt=media\&token=a111a43b-f91a-4b89-a5b5-0b3a0aa04e2c)

The Reduction gear is a [Machine](/mechtrauma/items/machines.md) which reduces the rotational speed and increases the torque of the Kinetic Force generated by a Steam Turbine. When powered with [Kinetic Force](/mechtrauma/dead-links/power-types.md), it is effectively identical in function to an [Engine](https://barotraumagame.com/wiki/Engines). It should be wired accordingly in order for the sub to be able to move normally. There are two visually distinct but functionally identical variants.

#### Technical Information

The item ID for the Steam Boiler is "boiler". The item ID for the Horizontal Steam Boiler is "steam\_boiler\_h". The item ID for the Advanced Steam Boiler is "advanced\_boiler". The item ID for the Steam Turbine is "steam\_turbine". The the item ID for the brown Reduction Gear is "reduction\_gear. The item ID for the gray Reduction Gear is "reduction\_gearv2".