Re: Woman dragged along platform by Tyne-Wear Metro train

Michael Bell wrote:

I am disturbed by the statement (above) that trains "would never get
away" if the switches detected even a small object. I think some
public education is called for. There can be mechanical aids for that,
for example, put on a light and sound a hooter INSIDE the door that
hasn't closed properly, open and try again to close THAT door, but
leave shut all other doors, so that late passengers don't try to get
on.

Part of the problem is getting the switches set to just the right
point. How often should you be willing to do this? Once a month? Quite
a burden! You could have the doors stop well short of hard contact and
use sensistive edges to detect in particular, moving objects. Do you
remember the sensitive strips that were fitted to buses for "stop at
next stop"? Something like that.

The rules for new-build can be found at.

http://www.rgsonline.co.uk/docushare/dsweb/Get/Rail-41178/Rt2473.pdf

B6.3 Requirements for obstacle detection

To minimise the risk and extent of injury, all external passenger
doors shall be designed to prevent obstacles being trapped in the
door. As a minimum, the following requirements shall apply:

a) When the door is closing and a bar with a maximum rectangular
cross section of 30 x 60 mm is trapped with its long edge
vertically between the door leading edge and the frame, or
between door leaves either:
i) the closing force shall be automatically reduced, or
ii) the door shall automatically re-open to allow the bar to be
removed, or
iii) the bar shall be capable of removal by exerting a force no
greater than 150 N.
The door shall not be indicated locked and the requirements shall
be verified at the bottom and middle height positions of the
door.

b) When an obstacle, in the form of a smooth bar, with maximum
dimensions of 10 x 50 mm is trapped with its long edge vertically
between the leading door edge and the frame or between two door
panels, it shall be capable of being withdrawn with a force not
higher than 150 N, measured perpendicular to the door surface.

Chris
.

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