Not sure, but I have to ask...in order for the coal to be loaded into the tower, was there a conveyor belt machine used to load it?
No, not a conveyor. Generally, on one side of the coal dock, was a track which the hopper cars could dump the coal down through grating in the track. Then there was a "bucket/car" on a track that went vertically up the outside of the coal dock, and the "bucket/car" was pulled by a large cable. At the top of the track, the "bucket/car" was dumped into the interior of the coal dock, through an opening that could be opened & closed, to keep rain/snow out. Depending on the size of the coal dock, and how many steam locomotives were fueled per day, the process of re-filling the coal dock could be almost a continuous operation of raising and lowering the "bucket/car".
Some railroads, with massive multi track coal docks, even had a track built adjacent to the coal dock, on a VERY steep incline so that a switch engine could push 1 or 2 coal hoppers up the ramp at a time, and then the coal would be dumped directly into the coal dock.
Refilling the large coal docks was a major, almost, full time job.