The term originates from the times of steam engines when large amounts of water were essential.
During the very early days of steam locomotives, water stops were necessary every 7–10 miles (11–16 km) and consumed much travel time.
[1][nb 1] With the introduction of tenders (a special car containing water and fuel), trains could run 100–150 miles (160–240 km) without a refill.
[7] On the other hand, with the replacement of steam engines by diesel locomotives many of the then obsolete water stops, especially in deserted areas, became ghost towns.
During the days of the Wild West, isolated water stops were among the favorite ambush places for train robbers.