In 2005, Molly made her debut in the ninth series of Thomas & Friends in the episode, Molly's Special Special. She later appeared in the tenth and eleventh series and also in the special, The Great Discovery.
Molly has not appeared in the television series since 2008.
Molly is based on a Great Eastern Railway D56.
Behind the scenes
Gauge 1 model
Molly's model was scratch built from brass to run on gauge 1 track, Her wheels and chassis were CNC.
Four facial expressions were made for her that were seen on screen as well as four prototype faces. The faces were first sculpted in clay and from that resin casts were made using a silicone mould.
The eye mechanism had two servos one for up and down movement, The other for left and right movement.
Like any other tender engines, Molly had wires between the engine and her tender. This was also seen in sideview promo art drawn based on the Production Measurement Reference.
In the episode, Molly's Special Special, Molly was seen with a lamp. This was powered by a hidden battery pack.
Her face was small in the series but she originally had a larger face, assumed to be a prototype as it never made its way into the television series though almost all of her merchandise depict her with her prototype face (this includes packaging art). Three of Molly's prototype faces are now owned by Twitter user ThomasTankMerch.
- Keiko Nemoto (Japan)
- Blanche Ravalec (France and French-speaking Canada)
- Celine Fontanges (Germany; Audio Books only)