Demonstration review of Thomas The Tank Engine Thomas & Friends Mavis' Rocky Delivery. Mavis works hard at the Blue Mountain Quarry. Watch the Quarry Car Pop Out from Mavis' Cargo Car. Have a look.br br Subscribe to Our Channel here br Here at ToyTrains4u we make story, educational and review videos of all our favourite toys. So if you like to see the toys you actually play with featured in stories then Toy Trains 4u is the channel for you. We also have a lot of toy surprises by way of toys in surprise eggs or toys concealed in Play Doh.