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| | Electric, locomotive, multiple unit, batteries |
 | | Modern urban mass transit systems like metros and EMUs (Electrical Multiple Units) involve not only high traffic density and frequency, with large numbers of passengers carried in often-crowded conditions, but they frequently have extensive sections of track underground. |
 | | On electric locomotives, batteries are used to raise and lower the pantograph to connect the overhead catenary and also to supply emergency power as back-up for the low voltage system. |
 | | With both EMUs and electric locomotives, emergency power is required for systems such as lighting and air-conditioning, computing, communication and door control. |
| www.saftbatteries.com /080-MS_Rail/040-10-10_Electric_locomotive_multiple_unit.asp (231 words) |
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