A mischievous dog almost disrupted Light Rail services in Yuen Long yesterday when it ran from Nai Wai Tsuen estate and crouched on the ground next to the rail track at Nai Wai station and refused to move at about 1pm. The owner of the large dog tried to pull it to safety but could not get it to budge. Police were called to the scene but they too were unable to entice it to move. The owner finally managed to coax the dog to safety with some food. Light Rail services were not affected.