Technical Specifications

By starting the serial production of rail buses for JŽ, the “Goša” factory established itself as the only Yugoslav manufacturer of this means of transport.

Rail buses are produced according to the documentation of the well-known German company WAGONFABRIK UERDINGEN, and to a large extent, they are adapted to the conditions of Yugoslav traffic.

The factory began production of rail buses in 1956. In this relatively short time, a total of 75 sets of rail buses were produced and delivered. However, for the year 1961 alone, another 75 sets were manufactured. The significance of this contribution to Yugoslav transportation is illustrated by this data: 150 sets of rail buses provide a total of 18,450 seats and 11,400 standing places (thus, a total of 29,850 seats), meaning that by the beginning of 1962, the fleet of Yugoslav Railways will consist of rail buses produced solely by the “Goša” factory.

During regular production, besides focusing on quality, the main aim of the factory was directed towards the independence of domestic production from imports, which, in a relatively short period, yielded visible results.

Regarding the cost-effectiveness of rail buses as vehicles and their advantages over modern passenger carriages, it is sufficient to mention the comparison of vehicle values expressed per seat to obtain a very significant data point for analysis. According to this comparison, the price of a rail bus per seat is about 30% lower than that of a passenger carriage seat.

Rail buses are intended for suburban traffic, especially in industrially developed areas, but they are also used on longer routes, in which case the trailer has a luggage compartment.

A set of rail buses consists of motor cars and a trailer, whose dimensions are the same.

The lower frame and the frame of the front and side panels are constructed from welded steel pressed profiles. The roof frame, its cladding, and the cladding of the side panels are made of aluminum alloys.

The aluminum cladding of the side panels, front, and roof is attached to the carriage frame with aluminum rivets.

The floor is made of corrugated steel sheet with a thickness of 1.5 mm and covered with wooden floorboards and a poured floor.

The carriage represents a separate unit that is supported on the base via air or coil springs. The base is made of rolled profiles of frame construction, and it is supported on the carriage axles via leaf springs and the housing of cylindrical bearings. The motor and transmission elements with brake, heating, and cooling equipment are mounted on the base frame.

Thermal and sound insulation of the carriage box is achieved with granulated cork and cork panels on the floor, while the frame insulation is made with glass wool covered with polyvinyl.

The interior cladding is made of plywood, coated with polyvinyl to the lower edge of the windows, and the ceiling is painted white.

Each carriage has a separate toilet compartment.

The external entrance doors are three-leafed, made of aluminum profiles and sheet metal. The windows are made of safety glass, divided into two parts, with the possibility of opening the upper half. Ventilation is provided through openings located on the vehicle’s roof, with adjustable ventilation, and additional ventilation is achieved by opening the upper half of the windows.

Heating in the motor carriages is provided by five independent heaters, three of which are located under the heating seats of the carriage, and two are on the fronts of the motor carriages for heating the windows in front of the driver and the driver’s seat. All heaters use heat from the engine’s outgoing water.

Heating in the trailer is provided by two independent heaters, by injecting warm air (type “Webasto” 2 X 9,500 Kcal).

The vehicle is powered by a pre-chamber diesel engine with 150 horsepower, positioned on the base frame, beneath the floor of the motor carriages’ box. Power is further transmitted through a hydraulic clutch, a gearbox with electromagnetic clutches, drive shafts, and a directional gearbox to the carriage axles.

The gearbox has six speeds, with two neutral positions where the gearbox lubrication pump is engaged.

A gear transmission is installed on the axle, enabling a change of direction only when the vehicle is stationary. This change cannot be made while in motion, ensuring safety, which is consistently implemented in all remote control devices.

In the air brake system, a safety electrical device is installed, activating the brake if the driver does not maintain pressure on the engine throttle control lever.

The vehicles are equipped with the “Knorr” air brake system. Brake action is transmitted to the axles via disc brakes, and a dual-pipe system ensures its reliability.

The clutches are automatic, with a force of 65 tons, and are adjusted, like the brakes, to connect to other train compositions for depot dispatch in case of breakdowns.

The rail bus set is equipped with its own electrical lighting system using two 700 W generators and three groups of lead-acid batteries, providing 12-volt direct current.

Rail buses equipped with remote control can be coupled into a composition of 4 sets, with motor and the entire traction and braking system controlled from a single command post. This is enabled by built-in relays and electromagnetic valves with thermostatic elements, ensuring automatic engine shutdown and alerting the driver by preventing further travel until the fault is rectified.

The production of rail buses complies with UIC regulations.

Given the numerous positive features observed during the production and operation of rail buses, there is justified immense interest from customers for this type of product, both domestically and internationally.

The “Goša” factory has managed to develop a detailed technological production process for rail buses and to produce and harmonize it in line with the most modern manufacturing methods. This has significantly contributed to the outstanding quality of “Goša’s” rail buses.

In further efforts to refine this vehicle, in addition to the already installed electromagnetic rail brakes and remote control, the installation of air springs instead of coil springs has begun, which will significantly improve travel comfort.