Vertical boiler
![Detail of vertical boiler and associated steam engine in a working model steam launch](/Images/godic/202502/19/Power_for_Puffing_Billy2327.jpg")
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![Swiss rack railway locomotive (built 1858) for operating on the steep slopes of Rigi](/Images/godic/202502/19/Rigi_vertical_boiler2327.jpg")
![A 1905](/Images/godic/202502/19/BestTractor2327.jpg")
A vertical boiler is a type of fire-tube or water-tube boiler where the boiler barrel is oriented vertically instead of the more common horizontal orientation. Vertical boilers were used for a variety of steam-powered vehicles and other mobile machines, including early steam locomotives.