This is often the default setting in versions like Trainz 2019 (TRS19) and TRS22 . It locks the game to 30 FPS (half of a standard 60Hz monitor). This is highly recommended if your computer struggle to maintain a steady 60 FPS, as it provides a much smoother experience by preventing erratic jumps in performance.
In these fan-made scenarios, "The Half Engine" is a ghostly or mutilated figure that haunts disused lines. Pilots often report seeing a "scrap engine where only one half is standing". trainz half engine full
This synchronizes the game's frame rate with your monitor's refresh rate (typically 60Hz). While it prevents "screen tearing," it can be taxing on mid-range PCs. This is often the default setting in versions