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Metro

Belongs to:
Rail vehicle
Synonyms:
Subway
Description:

Metros are rail vehicles for the transportation of passengers in the public short-distance traffic. Metros are driven electrically (either via overhead rail tracks or the third rail) and exclusively run underground in both city centers and outskirts.
The measured values which are provided here refer to magnetic fields caused by the overhead rail tracks when a metro is passing by. The measurements took place either on board or at different locations near the railtracks. Measured values of magnetic fields caused solely by the overhead rail tracks without a metro passing by can be found separately under overhead rail tracks.
It has to be taken into account that many passengers are carrying a communication device in the passenger compartment so that high frequency fields occur too.

Frequency ranges:
  • 0 Hz (DC)
  • ≤ 300 Hz (ELF)
Type of field:
magnetic

Measurements (acc. to literature)

Germany
Measurand Value Feature Remarks
magnetic flux density 50–110 µT (maximum, measured) static magnetic field at a distance of 1 m from the platform edge with a metro passing by [1]
magnetic flux density 150–350 µT (maximum, measured) static magnetic field inside the vehicle [1]
Great Britain
Measurand Value Feature Remarks
magnetic flux density 20 µT (maximum, measured) alternating magnetic field in the driver's cab [2]
magnetic flux density 0.1–2 mT (measured) static magnetic field in the passenger compartments of a 600 V overhead rail track system consisting of two tracks [3]
magnetic flux density 200 µT (maximum, measured) static magnetic field in the driver's cab [2]
magnetic flux density 0.2 mT (measured) static magnetic field in the driver's cab for a 600 V overhead rail track system consisting of two tracks [3]
Poland
Measurand Value Feature Remarks
magnetic flux density 0.063–0.081 µT (mean, measured) alternating magnetic field mean values with 100 Hz sampling rate and bandwidth 5 Hz to 32 kHz [4]
magnetic flux density 1.97 µT (maximum, measured) alternating magnetic field maximal value with 100 Hz sampling rate and bandwidth 5 Hz to 32 kHz [4]

References

  1. Gerke M et al. (2020): [Electromagnetic fields in everydays life. Latest information on sources, applications and effects]
  2. Chadwick P et al. (1998): Magnetic fields on British trains
  3. Allen SG et al. (1994): Review of Occupational Exposure to Optical Radiation and Electric and Magnetic Fields with Regard to the Proposed CEC Physical Agents Directive. NRPB·R265
  4. Gryz K et al. (2009): Magnetic field related to transient currents of electric transportation systems- Assessment of human's exposure in metro cars