Thimble tube boiler
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A thimble tube boiler is a form of steam boiler, usually provided as an auxiliary boiler or heat-recovery boiler. They are vertical in orientation and would be considered a form of water-tube boiler.
Vertical boiler
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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.
Detail of vertical boiler and associated steam engine in a working model steam launch
Taffy a replica of Chaloner, a de Winton vertical-boilered narrow gauge railway locomotive
Swiss rack railway locomotive (built 1858) for operating on the steep slopes of Rigi
East London Harbour 0-4-0VB by Alexander Chaplin & Co.