If I recall correctly, calcium carbide was used as the fuel for miners lamps during the early 1900s. It reacts with water to produce acetylene gas. Note sure whether mines went through enough of it to require rail delivery but it maybe it could go in carloads to a distributor.
Best wishes, Dave
Dave,
Acetylene is also used for the fuel in oxyacetylene cutting torches. A very common item at any place where steel or iron needs to be cut.
I used to see gondolas with similar containers pass through Nampa, Idaho about 20-30 years ago, but I could not find any in my photo collection.
Thank you Jason for confirming my memory was not completely gone!
Carter
Edit: It is much safer and less space intensive to ship calcium carbide as a solid than it is to ship acetylene gas.
Another edit: The acetylene in the bottles used with the cutting torches is dissolved in acetone and a porous medium because it is so explosive. A tank car of pressurized acetylene gas would literally be a rolling bomb looking for someplace to go off. ???