APPROACH SLOW Proceed approaching the next signal at Slow speed. Trains exceeding Medium speed must begin reduction to Medium speed as soon as the engine passes the Approach Slow signal. APPROACH SLOW Proceed approaching the next signal at Slow speed. Trains exceeding Medium speed must begin reduction to Medium speed as soon as the engine passes the Approach Slow signal. APPROACH SLOW Proceed approaching the next signal at Slow speed. Trains exceeding Medium speed must begin reduction to Medium speed as soon as the engine passes the Approach Slow signal.