The reintroduced models of Bill and Ben comprises of Bill in yellow and Ben in blue, even though in the episode with which this release coincides, Bill was the first of the two to be repainted blue and Ben was only repainted blue while Bill was also blue.

Oliver appears in the Boulder Mountain Set despite not being featured in the episode it was based on: Rusty and the Boulder. The Wooden Railway merchandise line for the Thomas & Friends franchise was created by Roy Wilson of Learning Curve in 1992, with the line becoming publicly available in 1993. These original models were primarily constructed with painted wood, along with metal used in the coupling magnets and axles and plastic for the wheels and faces. These models were relatively simple, with simple wooden stubs for the funnel and dome, while details such as windows, whistles and buffer beams were omitted.Initially released with Bertram and the Scrap Cars; later reissued individually in 2012 and 2016 for limited release.

In 2007, several Wooden Railway products were recalled by RC2 Corp due to traces of lead in the paint, which posed a poisoning hazard. About 1.5 million products were recalled, although no cases of children being affected were reported. The recalled products included:In late 2016, some engines received smaller faces that no longer cover the whole smokebox front and others' faces were changed.

While Whiff's model has the correct amount of wheels, this results in him being longer than engines who should be the same size as him. Bertram's original model depicts him in his proposed tank engine form, with a completely new design. In his TV series appearance, he uses Duke's model with Smudger's face. When he was reintroduced in 2016, he was given a tender, but retained his bunker. In late 2011, TOMY bought out Learning Curve and as such acquired the rights to the Wooden Railway line. They sold the products previously planned to be released by Learning Curve for early 2012. The products due to be released in late 2012 coinciding with the special Blue Mountain Mystery were cancelled because Learning Curve had only developed the computer generated prototypes, before they were acquired by TOMY. Most of these cancelled releases with the new CGI style models were re-constructed by TOMY and sold under their name and a few others were later released by Fisher-Price. TOMY held the licensing until the end of 2012. The second known prototype of Thomas seen features six red HEROS wheels, no coal bunker details, and a face borrowed from Thomas's ERTL die-cast vehicle. Thomas has the most variations of any character in the Thomas Wooden Railway, with more prototypes, changes, and variants than any other character in the range.

Thomas & Friends Fisher-Price Wooden Railway, Rebecca Toy Train, Push-Along Engine and Coal Car

At 25 years, Wooden Railway was the longest-running and most popular Thomas & Friends merchandise line (with ERTL being the second longest-running at 20 years). Every child's imagination has stories to tell – and this cheeky steam engine is the perfect helper. Children create the stories, Thomas just delivers inspiration. Changes Volume VII (Note: Tiger Moth's propeller differs from the production model, suggesting the one seen here was a prototype)