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In the United States, the usual spelling of sulphur, is "sulfur." The state of Florida is a large customer for Canadian sulfur. Known as "S" on the periodic table of elements, the element is usually handled in a molten state, under steam pressure, known as the Frasch Process.
Sulfur pours like water at 265`d.F. Trucks haul thousands of tons a day into the Bone Valley Phosphate region of central FL. Phosphoric acid, and sulfuric acid are produced, and become out-bound loads.
Before the molten crude bulk sulfur in liquid form was used, dry rock sulfur was hauled from the Port of Tampa, inland to the chemical plants. Now the Port of Tampa brings in molten sulfur from the state of Louisiana, on ships like the Brimstone Sulfur, 23,000 short tons, per load. In my day, there were four sulfur truck terminals, in the Port of Tampa.
Today, one-hundred ton tank cars(like the Atlas, and Walthers sixteen thousand gallon tank cars), haul sulfur in trains of 97 cars, from the great white north, to Occidental Chemicals, in North Florida.
By the time the railroad picks up the cars, in Canada, the quick cooling liquid sulfur is solid. The cars have no baffles, and when delivered in Florida, they're hooked up to plant steam lines, and it takes three days to melt the load, so it will flow out of the tanker.
My trailer, a Fruehauf Rock/Sulfur Double tanker, had steam lines, but the 41 mile/one hour ride did not let the product cool down, and usually the load left the trailer clean. Twenty-five ton max, average 49,100 pounds of liquid molten sulfur, is 3024gallons, and took about eight minutes to unload. The Insulated tank only had a capy of 3600 gallons, that's how heavy sulfur is.
By the way, the double tanker had a dry bulk hopper, mounted around the shotgun barrel liquid tank. It looked like, and we called them "prarie schooners." The outer hopper, complete with air operated top hatches, and bottom clamshell type feedgates, hauled animal feed ingredients, of which our three trailers were the sole haulers of this product. All the other trucks, hauled fertilizer ingredients. Specific to our load, there was no railcar dump.
I saw the Seaboard System, #1776, a U36B, one day, in grey, and took a pic.
My tractor, Commercial Carrier Corporation, Mulberry Terminal, #6104, was a cabover Freightliner, with no sleeper, plan white, with twin 120gal, saddle tanks, with a Cummins Formula VT300 engine, and seven speed spicer tranny.
I hauled for five years, and enjoyed every minute. Enjoy Your Hobby! ACJ/Stallion.

sulphur cars on the CP- RAIL?