What advancement occurred in fire fighting technology by 1860?

The acceptance of the horse-drawn steam engine was a significant advancement in firefighting technology by 1860. This innovation marked a shift from hand-operated devices and enabled firefighters to transport water more rapidly and in greater quantities than ever before. The steam engine allowed for increased pressure and the ability to deliver water over longer distances, which was crucial for fighting larger and more destructive fires. This technology represented a move towards mechanization in firefighting, paving the way for future advancements and improving the overall efficiency and effectiveness of fire response efforts.

While other options such as water tankers, chemical fire extinguishers, and motorized fire trucks represent important developments in firefighting, they occurred either later in history or did not achieve the same level of impact during that specific period. The horse-drawn steam engine stands out as a key evolution in fire service capabilities at that time.