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Does this help? By the way, there are two (at least) versions of Thomas, one with a split frame and flywheel and one without, but I think removing the shell is the same for both.
They make James, Henry,and Percy. Nothing against NewhallStation, but Plaza Japan(an ebay store) has much better prices, that's where I got James, Henry, and Percy(my father-in-law got me Thomas when he was in Japan).