Molton Sulfur Trains?

Early in my career I worked for a company that shipped molten sulfur from west Texas to Galveston.  All of our cars were insulated and coil equipped.  Between the loading temperature, the insulation and the "heel" that normally remained in each car, the sulfur was still liquid by the time it would reach Galveston, generally within 72 hours of having departed origin. 

We'd still connect hot water to the coil lines while the cars were setting in our facility or in the process of being unloaded, simply to ensure the product would flow.

Curt