Which method helps maintain traction on slippery rails by introducing additional friction?

Which method helps maintain traction on slippery rails by introducing additional friction?

• A. Traction control systems
• B. Sanders deployment
• C. Automatic braking
• D. Wheel dressers

Answer: (B)

This item tests how wheel-rail adhesion is increased when the rails are slick. The method that actually adds friction at the contact surface is deploying sand onto the rails. Sand creates a rougher interface between the wheel tread and the railhead, filling micro-imperfections and increasing grip so the wheels are less likely to slip when starting, accelerating, or braking in wet or icy conditions. Traction control systems manage slip by adjusting power delivery to the wheels or applying braking to prevent spin, but they don’t physically add friction at the contact surface. Automatic braking reduces speed rather than increasing the friction between wheel and rail. Wheel dressers change the wheel’s surface to maintain proper shape and contact, which helps with wear and smoothness, but they don’t introduce additional friction by adding material to the rail.

This item tests how wheel-rail adhesion is increased when the rails are slick. The method that actually adds friction at the contact surface is deploying sand onto the rails. Sand creates a rougher interface between the wheel tread and the railhead, filling micro-imperfections and increasing grip so the wheels are less likely to slip when starting, accelerating, or braking in wet or icy conditions.

Traction control systems manage slip by adjusting power delivery to the wheels or applying braking to prevent spin, but they don’t physically add friction at the contact surface. Automatic braking reduces speed rather than increasing the friction between wheel and rail. Wheel dressers change the wheel’s surface to maintain proper shape and contact, which helps with wear and smoothness, but they don’t introduce additional friction by adding material to the rail.