After what major year did the use of the steam engine diminish significantly in fire fighting?

The use of the steam engine in firefighting diminished significantly after 1925 due to several technological advancements that transformed fire suppression methods. By this time, the internal combustion engine was becoming the standard for fire apparatus. These engines were not only more efficient than their steam-powered counterparts but also allowed for quicker start-up times and greater mobility.

Fire departments began to adopt gasoline-powered fire trucks, which provided greater flexibility in response times and the ability to carry larger amounts of water and equipment. As a result, the steam engine became increasingly obsolete in the firefighting context, with many fire departments retiring their steam-powered equipment in favor of these modern alternatives. Consequently, the year after 1925 marks a significant turning point when steam engines were largely phased out from active service in fire fighting.