Sure, here are two of the mentioned parts of steam locomotives in a bullet point list:

- Cylinders: these are cylindrical components in a locomotive's engine that contain pistons. Steam is admitted into the cylinders alternately from each end, causing the pistons to move back and forth.
- Pistons: these are mechanical connections in a locomotive's engine that move back and forth within the cylinders as steam is admitted, ultimately driving the locomotive's main wheels forward.

Let me know if I can help you with anything else!
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