👉 The train fluid, also known as brake fluid or anti-freeze fluid, is a critical component in the braking system of trains. It serves as a hydraulic fluid that transmits pressure from the brake pedal to the braking components, enabling effective deceleration and stopping. Made primarily of propylene glycol or ethylene glycol, this fluid not only cools the braking system by absorbing heat but also prevents freezing in cold weather, ensuring reliable braking performance across a wide range of temperatures. Its role is essential for safety and efficiency in rail transportation.