Thomas and Friends wooden Molly engine is a large, powerful and bright yellow train engine. A great addition to your Thomas Wooden railway. Molly is a brightly coloured train and has magnetic couplings to attach her to other carriages and trucks.She is proud of her strength and wants it to be used and useful. As well as being mighty, however, Molly is also sensitive. She's very aware of what the other engines think of her and wants them to think the best.