IEEE Electrification Magazine - September 2014 - 32

By Ramón R. Pecharromán,
Álvaro López-López, Asunción P. Cucala,
and Antonio Fernández-Cardador

Riding the Rails to
DC Power Efficiency
Energy efficiency in dc-electrified
metropolitan railways.
NERGY AND ENVIRONMENTAL SUStainability in transportation have
become crucial in recent decades.
According to the Intergovernmental
Panel on Climate Change's Fifth Assessment Report (AR5), the transport sector accounted for
27% of the final energy use and 6.7 gigatons of CO2
direct emissions in 2010, with baseline CO2 emissions
projected to approximately double by 2050. Reductions
in total transport CO2 emissions of 15-40% compared to
baseline growth could be achieved in 2050. In this context, railway systems are growing steadily more important in developed countries. Their high energy efficiency
makes them preferable to other transportation methods, both for passengers and freight. In the case of passengers, they are able to move a large number of people
without local emissions, thus reducing pollution. Electrified railway lines also contribute to the use of renewable
energy sources.
Despite the fact that electrified railway systems
are very efficient, reductions in energy consumption
are continuous because of concerns about sustainability and the high share of energy costs in the total
budget of railway companies. This consumption
reduction may come from different fields such as:
x Rolling stock: mass reduction, aerodynamic
improvement, onboard energy storage, configuration, and the use of auxiliary services

E

Digital Object Identifier 10.1109/MELE.2014.2333684
Date of publication: 29 September 2014
TRAIN COURTESY OF WIKIMEDIA COMMONS/OLIVIER CLEYNEN

32

I E E E E l e c t r i f i cati o n M agaz ine / september 2014

2325-5987/14©2014IEEE



Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2014

IEEE Electrification Magazine - September 2014 - Cover1
IEEE Electrification Magazine - September 2014 - Cover2
IEEE Electrification Magazine - September 2014 - 1
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IEEE Electrification Magazine - September 2014 - Cover3
IEEE Electrification Magazine - September 2014 - Cover4
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