Traditional freight service is time and cost intensive partly due to complex
coupling and train forming processes which require costly facilities. Based on
the concept of self-propelled freight cars, a new method of train
formation has been proposed: virtually coupled train formations. The concept is
based on the idea of using modern electronics and data transmission to run
several self-propelled units one behind the other without physical contact but
at distances as short as mechanically coupled cars.
The train modules could automatically join or leave the virtual train
formation when they reach a junction. This way the advantages of self-propelled
freight cars could be combined with those of long loco-hauled trains:
- advantages of self-propelled freight cars: flexibility, no time-intensive
coupling processes
- advantages of long loco-hauled trains: reduction of aerodynamics through
coupled wagons, increased capacity by occupying only one slot (in a
fixed-block system)
Safety of virtually coupled train formations The close distance of the
multiple units requires all modules to have the same technical parameters known
in the system (weight, acceleration). Approaching a danger point the individual
train modules would have to keep at a least minimum braking distance.
Communication
Such a system heavily depends on information and communication
technologies. The communication requirements can be divided into two groups:
- A highly reliable and fast short range communication system to realise the
distance control (DECT could be a candidate here)
- A far range communication system with less requirements concerning
availability used for disposition (GSM could be suited for this
purpose)
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