Caption: Steam engines required more frequent fueling stops for coal and water than diesel, and as a consequence structures had to be set up at various junctions, terminals, and outlying points to supply them when running low. After the steam era ended so did their usefulness, and most were demolished in the following years.

The coaling tower pictured here is in Guelph at Canadian National's Guelph Junction, located by Crimea and Alma Streets. A pair of CN hoppers are spotted below the tower with "blue flag protection" applied, where they dump their coal into a pit under the track (note the piles of coal on the ground around the hopper bays), which is then scooped up into the tower via a conveyor system and deposited inside, waiting to be dumped into steam engines via the chutes located around the platform.