Firebox/zh-hant

火箱是蒸氣動力車輛 上用於燃燒燃料 加熱鍋爐 內水 的地方。火箱的位置受一部分鍋爐包圍，燃燒產生高溫廢氣透過「煙管」穿過鍋爐，最後抵達鍋爐前方的「煙箱」，被推向煙囪排出。

燃煤車輛上，打開駕駛室 內的「火箱門」，可將煤炭鏟 入其中。它在其他時刻應保持關閉，避免排氣倒流，即因壓力改變廢氣將火焰帶入駕駛室，可能對機組人員造成的災難後果。此會在火箱門敞開，進入隧道時發生。

要點燃煤碳，使用打火機 。

火箱內的溫度能透過一個溫度計監控。火箱應保持在剛好足以產生所需蒸汽量的溫度。溫度過低將無法產生足夠的蒸汽，溫度過高則可能導致燃料消耗效增加。

Firebox temperature is controlled by the amount of coal and airflow inside it. Simply having no more coal to burn will cause the firebox to cool down, and adding more coal will warm it up if the airflow is sufficient. The amount of airflow is key, and depends on whether there is steam being admitted to the cylinders , but can also be adjusted by the blower and damper controls.

Having the firebox full to the brim with coal is not always the best choice. Too much coal with too little airflow negatively affects fuel efficiency , resulting in a lot of coal particles getting spewed out the chimney before fully burning. This is what makes the exhaust dark. When coal amount is proportional to available airflow, however, coal burns cleaner and the exhaust color is more bright.

司機員若要精準控制火箱中的煤炭量，可以選用專家鏟子。使用位於火箱門旁的拉桿也能將火箱內的煤炭自當中排出。.

Coal in fireboxes can be dumped manually, with the coal dump lever found next to the firedoor.