A fireman, stoker or watertender is a person whose occupation it is to tend the fire for the running of a boiler, heating a building, or powering a steam engine. Much of the job is hard physical labor, such as shoveling fuel, typically coal, into the boiler's firebox. On steam locomotives the title fireman is usually used, while on steamships and stationary steam engines, such as those driving saw mills, the title is usually stoker (although the British Merchant Navy did use fireman). The German word Heizer is equivalent and in Dutch the word stoker is mostly used too. The United States Navy referred to them as watertenders. Nautical Royal Navy The Royal Navy used the rank structure ordinary stoker, stoker, leading stoker, stoker petty officer and chief stoker. The non-substantive (trade) badge for stokers was a ship's propeller. Stoker remains the colloquial term used to refer to a marine engineering rating, despite the decommissioning of the last coal-fired naval vessel many years ago. Large coal-fueled vessels also had individuals working as coal trimmers, who delivered coal from the coal bunkers to the stokers. They were responsible for all coal handling with the exception of the actual fueling of the boilers. Royal Canadian Navy The Royal Canadian Navy had coal-fired ships, the last of which were replenishment ships. All marine engineers in the RCN, regardless of their platform (CPF, 280 or AOR) are nicknamed stokers. United States Navy In the United States Navy, watertender (abbreviated WT) was a petty officer rating which existed from 1884 to 1948. Watertenders held a paygrade equivalent to today's petty officer first class. A chief watertender (CWT) paygrade was established in 1903. In 1921, the lower paygrade was split into watertender first class (WT1 or WT1c) and watertender second class (WT2 or WT2c). Another lower paygrade, watertender third class (WT3 or WT3c), was established in 1943. The watertender and boilermaker ratings were merged into a new "Boilerman" rating in 1948 and continued to 1976 when the rating was changed to "Boiler Technician" and subsequently merged into the "Machinist's Mate" rating in 1996. Railways On steam locomotives, firemen were not usually responsible for initially preparing locomotives and lighting their fires. As a locomotive boiler takes several hours to heat up, and a too-rapid fire-raising can cause excess wear on a boiler, this task was usually performed by fire lighters working some hours before the fireman's main