Fireman Assistant
🟡 Updated this yearThis mod may not work until the author updates it. Check for an update, or see the rollback guide.
Preview

🔍 Analysis
- 👍 1.9% endorsement rate — high engagement, a strong quality signal
- 🏆 #15 of 149 Gameplay mods in this game by downloads
📋 About This Mod
FiremanAssist
Fireman Assist Mod for Derail Valley
Entering a supported loco will add a fireman to that loco. You can also request a fireman with the comm radio, and finally, coupling a supported loco to a train that already has a fireman onboard will add a fireman to that loco (no limit). Fireman state is not persisted across save games currently but can be reinitialized quickly after a load.
Current Features
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[]Water Management from minimum protection to full management
[
]Slope-aware water management - understand the current water angle to interpret what it's seeing in the water glass.[]Fire Management from minimum protection to full management
[]Throttle and Cutoff aware fire management - will allow the fire to cool if the engine is idling - keeping the pressure around 12-13 bar. Ramps up coal usage as steam demand increases - but requires more than a momentary burst of usage to do so, so still good for shunting
[]Comm Radio control to advise fireman to start or stop firing - Also shows current state, including out of water.
[]Cylinder Cock control (useful when using MU mods to run multiple steam units)
[]Each locomotive is managed independently
[]Low Tender Water auto shutdown - prevents automatically adding coal when the tender is low on water - thus protecting against getting into an uncontrolled fire state with not enough water to add to the boiler.
[]NEW Dismissable fireman - Fireman can be dismissed, and does not get added automatically to an existing loco
[]NEW Multiple firing levels selectable through the radio.
[]NEW Persistent fire state between saves
Water Management Options
Water management in 4 levels, selectable through UMM settings window:
[]None - turns off, useful if you want to disable the management temporarily without disabling the mod, say for a realistic save
[]No Explosions - Ensures you never let the water get too low. Can still overfill and damage your cylinders, but will never underfill so long as you have water available to add (and the injector can keep up, those grade transitions can get intense).
[]Over/Underfill protection - Ensures you never let water get too low or too high. Might allow overfill if going downhill for an extended period of time, as it uses the same information the user has (the water glass)
[*]Full management - Does its best to provide the optimum injector setting
Fireman Assistant is a gameplay mod that adds a full-featured assistant to handle the extra jobs on the train. It has 137 endorsements and 7,340 downloads, last updated November 2025. This mod is for players who want to offload secondary tasks and focus on driving.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Solid community support with 137 endorsements and over 7,000 downloads.
- Actively maintained, last updated November 2025.
- Fills a niche for players who want to focus on driving rather than juggling tasks.
⚠️ Cons
- Limited to train-related gameplay; may not appeal to players outside that niche.
For train sim enthusiasts who want to delegate secondary tasks and focus on the main driving experience. Skip if you prefer hands-on management of every aspect of the train.
💡 Beginner Tips
- Check the mod's page for any required dependencies before installing.
- If using a mod manager, enable the mod and test in a single-player session first.
- Look for in-game settings to configure which tasks the assistant handles.
📊 Mod Details
- Game
- Derailvalley Mods
- Author
- lassombra
- Version
- 1.3.2
- Downloads
- 7,340
- Endorsements
- 137
- Category
- Gameplay
- Created
- 8/19/2023
- Updated
- 11/1/2025
🔧 How to Install Derail Valley Mods
Download from Nexus Mods.
📖 Full step-by-step install guide for Derail Valley →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Derail Valley commands, item IDs, and more.
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