Steam locomotives required water and fuel for their operation, the main types of which were coal, peat, firewood and oil.
All steam locomotives had to have a supply of fuel and water. To work on main lines, special wagons were constantly attached to the locomotives, which contained supplies of water and fuel. These wagons were called tenders. Some locomotives, which were used for shunting or short branches, did not have tenders and carried the entire supply on themselves. Such locomotives were called tank locomotives. The volume of fuel varied from several hundred kilograms to 30 tons.
A tender is a U-shaped water tank mounted on a frame, on top of which fuel is placed. The height from ground level to the top of the tank reached 3.5 m. Special mechanisms were needed to load such a volume of fuel. For small volumes and in exceptional cases, fuel was loaded manually with buckets.
Different devices were used to load coal. The simplest were wooden trestles, onto which a cart or trolley with coal was rolled and their contents were tipped into a tender box.
Less capital structures were coal-lifting cranes, the so-called "cranes". Their design was adopted from well "cranes". The "crane" was a beam on a vertical support. Unlike a well "crane", the beam could rotate around the support axis by 360 degrees. At one end of the beam there was a counterweight, and at the other - a bucket into which coal was loaded. The counterweight was designed so that after loading the bucket with coal, it could outweigh this bucket, that is, lift it up. To lower the empty bucket, a rope was used or a loader jumped into it.
To deliver a large volume of coal, where there was not enough gravity, a mechanical or steam drive was built. The steam for the operation of such "cranes" was taken from the steam locomotive.