Every day, one of the engines has to go to the factory where their trucks are filled with Mr Jolly's world-famous chocolate bars and other confections. His chocolate is so popular that, on occasion, Harold has been employed to deliver it to places that the engines cannot get to. Percy once smashed through the walls of the factory and got covered in chocolate, but, just like all the other engines, he is still very pleased to be given the opportunity to visit the factory.
Ever since Percy had his accident here, it appears to no longer be located at the bottom of a hill. According to a 2014 television series map, it is located just north of Killdane on the Peel Godred Branch Line.
It first appeared in the sixth series and also appeared in the eighth series and Calling All Engines! Mr Perkins also mentions Mr Jolly's Chocolates in a postcard about Brendam Docks for his friend Elliot.
- The factory's logo is seen on the Take-n-Play racing Thomas' side amongst the other advertisements.
- The factory's logo used in a deleted scene of the sixth series episode, Percy's Chocolate Crunch is now in the possession of Thomas Merchandise on Twitter.