TZV Gredelj

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Low floor diesel multiple unit for regional transport

The prototype of diesel electric multiple unit (hereinafter DMU) for regional traffic is a 3-part train set composed of two end motor modules containing driver’s cab and one middle motor module without driver’s cab. All the modules are supported by two bogies, one of which is a drive bogie and the other one a running bogie. All drive equipment is situated on the roof of a module. On module roofs are mounted diesel generator groups with belonging converters, which supply and control the operation of electric drive motors situated in the bogie.
A train is equipped with eight double-sided doors of 1300 mm width and seats of adequate comfort. In the door area of a module containing driver’s cab there are installed toilet facilities, with one of them adapted for disabled persons in wheelchairs.
The passenger areas of all three motor modules are mutually connected by means of bellows, thus creating one single area without partition walls. The arrangement of train equipment enables for floor to be approximately at the same levels: the floor in the bellows zone is at 875 mm height, while transition passages to 600 mm floor height between the bogies are constructed by slightly inclined ramps (inclination 1:8). The area is equipped by handholds for the needs of standing passengers. Seats are constructed as two-seaters, except for the part intended for disabled persons in wheelchairs and parents with children in pushchairs, where there are single and folding seats. Part of the area at entrance of one motor module with driver’s cab is equipped with bicycle hangers.
A train is designed in a way that its functionality, comfort and esthetics, as well as company’s care for passengers is also reflected trough modularity, equipment accessibility and methods of maintenance. Control of diesel engine is performed by means of a computer according to diesel engine manufacturer algorithm in compliance with requirements coming from the central computer based on the driver’s requirements, current driving conditions and already achieved train drive parameters, as well as current condition of the diesel aggregate itself. DMU drive consists of three independent drive units. In case of malfunction of one of the drive aggregates, it can be switched off, and DMU can continue running, but with reduced power. Traction and braking of DMU is controlled in a simple way as requirements are set over the same control handle. Depending on track conditions and designated brake parameters, it’s enabled trough electro-dynamic, pneumatic or magnetic brake, i.e. by combination of the mentioned brakes. Connecting of the three DMUs into one whole is enabled trough the automatic couplings ensuring complete control over DMU from one control position. Both DMU driver’s cabs are equipped with external side cameras for monitoring the movement of passengers and the outside area of the DMU. In all modules there are installed cameras for internal surveillance.