Fuel Bucket

The Diesel Fuel Bucket is the primary fuel source for diesel locomotives. It is created through the Diesel Fuel Refinery, where various organic and mineral items are processed into usable fuel. Diesel engines such as the Front-cab Diesel and Mid-cab Diesel rely on this bucket to operate.
Functionality
Fuel is generated by placing items into a Diesel Fuel Refinery, each with its own chance of producing fuel. Rotten flesh is one of the worst sources, while coal and coal blocks are among the best. Other valid inputs include nautilus shells, dried kelp, resin clumps, bones, charcoal, and similar materials. When the refinery fills, the resulting fuel can be collected directly into a bucket to produce a Diesel Fuel Bucket.
Interaction
Players use the Diesel Fuel Bucket by interacting with a diesel locomotive to fill its internal fuel tank. Fuel Tenders can also store multiple buckets and automatically refuel engines when coupled directly behind them.
Obtaining
Fuel is created in the Diesel Fuel Refinery from eligible items, and once the refinery reaches a full level, a bucket can be used on it to extract one Diesel Fuel Bucket.