Alternative way of handling copper, iron and crafting steel. As a bonus mod gives you molten form of plastic and sulfur for alternative storage/transport.
Small changes concerning balance, gameplay, or graphics.
New Ores and resources as well as machines.
Things related to oil and other fluids.
Furnaces, assembling machines, production chains.
In North America sulfur is sometimes transported by rail in heated tank cars.
Apology for very late reply - added molten sulfur, thanks for the suggestion!