Coal Coke (Railcraft)

Coal Coke is a fuel source introduced by Railcraft. It's created in a Coke Oven, and burns twice as long as Coal in furnaces and most other applications.

Usage
Coal Coke can be used as a higher efficiency fuel source. One stack of Coal Coke will convert 64 Iron Ingots into 64 Steel Ingots in the Blast Furnace, whereas a stack Coal will only convert 16 Iron into Steel.