A driver tends to the boiler of a steam train while in the station. Normally you'd have a dedicated fireman to do this, but as the Romney, Hythe and Dymchurch runs on a hilariously small gauge, one man has to do every job on these engines.
https://files.mastodon.social/media_attachments/files/112/923/617/311/761/568/original/81cc455c0b721279.jpg