Page 4 - Innovation in energy management: contribution of railways to sustainable mobility

ACRONYMS AND DEFINITIONS

AC. Alternating Current (facility).

DC. Direct Current (facility).

DAS (Driver Advisory System). System that allows the exchange of information between the
railway system and the driver to optimise train driving, obtaining, among other things,
energy savings.

DCS (Data Collector System). Computer application that facilitates the data collection
process, allowing the acquisition of structured and specific information in a systematic
manner, and subsequently being able to perform data analysis on the information.

DMU. Diesel Multiple Unit (formed by several carriages).

EMS. On-board Energy Measurement System.

EMU. Electric Multiple Unit (formed by several carriages).

ESS. Electrical Storage Systems.

EU. European Union.

EU-Rail JU. Europe’s Rail Joint Undertaking. European partnership on rail research and
innovation (successor of Shift2Rail Joint Undertaking).

External Network. AC power line (three-phase) that feeds the traction power substation.

FACTS (Flexible AC Transmission Systems). Static devices that are controlled by
computerised control systems coupled with high-power electronics. They can be used to
compensate for imbalances, that is, as load compensators when used with special control
algorithms. They can also be used to dynamically support voltage drops on the
Transmission Line and reduce harmonics from rolling stock.

IEA. International Energy Agency.

LNG (Liquefied Natural Gas). Natural gas in liquid phase at a temperature of -160ºC, which
is why it is considered a cryogenic liquid. It is stored and transported in highly insulated
containers to maintain its liquid state. The advantage of the liquid state is its smaller
volume, since for each litre of LNG, approximately 570 litres of gaseous natural gas are
obtained at room temperature. It is made up of 95% methane (CH4) and contains tiny
amounts of ethane, propane, butane, nitrogen and carbon dioxide. It is an odourless,
colourless fuel that is non-toxic and non-corrosive.

RFIG. General Interest Rail Network.

SSEE. Electrical Traction Substation

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Position paper: Innovation in energy management: contribution of railways to sustainable mobility
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