Investigating The Impact Of Track Gradients On
Traction Energy Efficiency In Freight
Transportation By Railway
Author(s)
G. Bureika & G. Vaičiūnas
Abstract
Energy recovery is an effective method of energy saving which can be used for
traction in freight transportation by railway. In this area, energy recovery is a
process of converting the kinetic energy of a moving train in electricity, which is
transferred to another energy consumer (another train using the traction energy)
through a catenary. Energy recovery can be effectively used for carrying various
raw materials (e.g. timber, oil, etc.) to seaports by railway. The loaded wagons
which are much heavier than unloaded wagons carry goods \“down” to the
seaports, while empty trains return (i.e. go ‘upward’) to the continent. The
seaports are only several meters above the sea level, while the places of freight
dispatching can be hundreds of meters, or even kilometres, above the sea level.
The asymmetry of freight flows (when the freight flow directed \“downwards” is
several times heavier than ‘upward’ freight flow) may be effectively used for
energy recovery. The research performed shows that, given an appropriate
combination of the asymmetry of the freight flows in opposite directions and
particular track gradient, the potential energy of freight trains may be used for
freight transportation by applying energy recovery techniques. This allows the
authors to make an assumption that this could serve a theoretical basis for
making feasible one-way freight transportation by using only the recovered
energy of the train. On the other hand, taking into account the rolling resistance
of the train, there should be some limiting values of the ratio of the freight flows
in the opposite directions, and the track gradient should not have small values
(e.g. track gradient or the ratio of freight flows should not be too low). If that is
the case, the inertial freight transportation is not possible, and an external energy
source sufficient to overcome the rolling resistance of the train is required.
Keywords
locomotive traction, freight transportation, track gradient, track curve, freight flow asymmetry coefficient, energy recovery ratio
Related Book
Other papers in this volume
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