Thomas & Friends S06E20 - Toby Had a Little Lamb

During a snowstorm, Toby is flagged down by Farmer McColl, whose sheep are due to give birth and urgently need a vet. At the next station, Toby explains and Duck and the vet set off for Farmer McColl's Field. However, even Duck's snowplough cannot cut through the snow and they are forced to retreat. Now, Toby must use his old line to save the lambs.