Postman Pat - Series 4 - 12. Postman Pat and the Rocket Rescue
Children's animation following Greendale's postman and his cat. The kids' giant snowball crashes onto the railway, but Pat stops the train in time.
The snowfall is heavy and the kids are out snowboarding. They build a giant snowball which careens out of their control and crashes onto the railway line. They wave at the train and try to make it stop, but it's only when Pat arrives and waves his coat, which has reflective bands, that the driver's attention is caught, and the train stops just in time.