Locomotive castings for the QR steamers 1898 to 1958 will still be available in 5" gauge. A10 and BB18 also in 7 1/4"  A range of castings for these models is still available as ex stock but possibly not complete sets. Due to the fluctuating costs of metals and casting charges it has become uneconomic to keep all castings of all models as stock items. Hobby Mechanics will continue to assist customers to source castings on a bespoke basis in the future.