The image shows from side a hopper wagon assigned for the freight trains, intended for the transport of liquids, respectively, petroleum products such as: diesel, gasoline, fuel oil, crude oil.
The wagon, also known as the rail tanker, is represented in the shape of an embossed and elongated rectangle, with the left and right edges slightly domed on the outside and rounded.
At its base are four pairs of wheels, from the side illustrated as four thickened circles, with a dot in the middle, located two to the left and two to the right of the base.
The car body or outer shell of the wagon consists of an elongated metal tank with valves or boiler, placed on the chassis or wheeled frame of the wagon, in which the flammable liquids are transported.
The liquids are pumped in or loaded at the top of the tank, through the opening on the roof, and the discharge or the pumping out is made at the bottom, through the central and side taps.
The side taps, bottom left, are highlighted by a textured square with oblique and parallel lines.
In the center of the tank is a long ladder, which leads to the roof and allows the operator to climb to load the tank, being rendered by two vertical and parallel lines, joined by short, horizontal and parallel lines.
At the right and left edge of the wagon, on the lower bar, are placed two buffers, highlighted by a short line, thickened and horizontal, with the end joined by a thickened semicircle.
The buffer consists of a piece in the shape of a metal disc, with the role of keeping a certain distance between the coupled wagons and to cushion the shocks between them while moving.
A man is standing in the right bottom corner, thus positioned to facilitate the comparison of the dimensions of the wagon to the height of an adult.
There is one type of wagon for each type of cargo. The reason for such a wide range of wagons is that they are relatively easy to make, especially for manufacturers of metal structures. A wagon is composed of a kind of platform and a container that holds the goods.
Wagons for the transport of oil fluids – zas and zaes
Z series wagons are intended for the transport of edible oils, molasses, bitumen, petroleum products, sulfuric acid.
They are also called tank cars and have 4 axles.
The oil products transported include diesel, gasoline, fuel oil, oil, but also others.
The container mounted on the wagon is a welded construction, its loading being made on the upper part of the tank, and the unloading is made gravitationally on the lower part by means of central and lateral valves.
These wagons do not allow the pressure increase inside it, there is a valve that opens at a pressure of 1.5 Bar, a pressure slightly lower than the pressure from the valve.
The metal containers are closed and the water cannot penetrate into their enclosure.
Often these containers are used in fuel delivery for power generation solutions, backup generators, etc.
The storage capacity is 60 or 70 cubic meters, depending on the model.