Wheel slip and adhesion management involves

• A. Loss of traction due to insufficient friction; adhesion is managed via traction control systems, sanders, wheel slip detection.
• B. A method of measuring wheel circumference.
• C. A safety procedure for door closing.
• D. A braking technique for steep curves.

Answer: (A)

Adhesion management focuses on how wheel-rail friction lets the train push or brake effectively. When traction is insufficient, wheels can spin without moving the train—loss of traction due to limited friction. To keep propulsion and control reliable, systems monitor wheel slip, automatically adjust drive torque, and use sanding to boost friction between the wheel tread and the rail. Traction control systems reduce power to prevent spinning, wheel slip detection signals when slipping is occurring, and sanders deposit material on the rail to increase grip, especially in wet or oily conditions. This combination directly addresses maintaining grip and preventing wheel slip, which is why it’s the correct description. The other options describe unrelated tasks—measuring wheel circumference, door-closing safety procedures, or a braking technique for curves—not about managing adhesion and wheel slip.