To view this newsletter as a web page, go to: http://www.irse.org.hk/eNewsletter/issue06/issue06.htm
- Best view with 1024 x 768 resolution -
| Institution of
Railway Signal Engineers
(Hong Kong Section)
Newsletter > News
Issue 06 @
|Y F Sung
Landslide detectors are installed when the track itself
is in danger of sliding away by earth slide or snow slide. Detection is
made by weak cables strung in zigzag formation within the risk zone
from fixed points or trip wires placed along the track.
Figure 1 Trip Wire for Landslide Detection
The trip wire at the section pulls a pair of break contacts of a relay
at each end and picks up a proving relay. Breakage of wire causes
protecting signals to be placed to danger or triggers other signals or
ATP to make the approaching train to stop. The detector may also send
an alarm to the control center or nearest station or signal box.
Similarly, where the flight path at the perimeter of an airfield passes
low over an adjacent railway, trip wires are provided. Should an
aircraft break these wires protecting signals are held at red in case
debris has landed on the railway or damaged has been caused to railway
equipment. In addition, direct telephone communication is available
between the railway control center and airfield control tower in the
event of an emergency.
Another solution for solving this type of problem is the installation
of CCTV, which gives the traffic operator a view of the area, enabling
him to stop the traffic if a dangerous situation occurs.
(Reference to Railtrack)
* * * End * * *
Comments and suggestions are
welcome. Please send an e-mail to Editorial
As a member of IRSE(HK), you will receive
a bi-monthly email newsletter.
IRSE(HK) respects your privacy. If you no longer wish to receive this
please send an e-mail to IRSE(HK)
Administration (E-mail: firstname.lastname@example.org) to unsubscribe.