Some community-created locos (especially from Jointed Rail or RRMods) include an "Isolation Switch" or "Half Power Mode" that limits tractive effort. Check the loco's right-click context menu or the Driver Commands list.
Popular creator and "Klambert" have released sound packs specifically for "Half Engine" transitions. These mods ensure that when you hit Notch 4, the engine room sound changes from a low grumble to a consistent, smooth hum—perfect for recording cab-ride videos. trainz half engine
You command an AI train to move, but it creeps along slowly even on a clear track. Diagnosis: The AI driver script often defaults to a "Half Engine" acceleration curve for heavy coal trains to prevent string-lining (derailing). Fix: Open the AI Driver's command list. Insert a "Set Throttle Percent" command before the "Drive to" command. Set it to "Set Throttle Percent: 100" to override the half-engine safe mode. These mods ensure that when you hit Notch
Unlike a real locomotive, Trainz doesn’t always have a physical "Half Engine" button. You must create the condition. Here are the three methods depending on your build (Trainz 2019, Trainz 2022, or TRS22+). Fix: Open the AI Driver's command list
For those interested in exploring the world of Trainz half engines further, here are some additional tips and resources: