Holy Cow...the prices have gone way up since they discontinued the Chuggington line. I am not exactly sure but by the looks of the shape and how the battery enters from the bottom, my guess would be it is similar to the newer C-11, C-12 steamer which I think uses a Thomas type motor but you probably surmised the same. I have had a few pass through here but I never had to completely dismantle one. https://www.1999.co.jp/eng/image/10190667/20/2
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