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- Path: sparky!uunet!munnari.oz.au!metro!socs.uts.edu.au!kralizec.zeta.org.au!kralizec.zeta.org.au!not-for-mail
- From: craig@kralizec.zeta.org.au (Craig Dewick)
- Newsgroups: rec.railroad
- Subject: Re: Switch Heaters?
- Date: 19 Dec 1992 09:43:43 +1100
- Organization: Kralizec Dialup Unix Sydney: +61-2-837-1183 V.42bis
- Lines: 35
- Message-ID: <1gtk6vINNjnd@kralizec.zeta.org.au>
- References: <37893@cbmvax.commodore.com> <1gl348INN74c@hp-col.col.hp.com>
- NNTP-Posting-Host: kralizec.zeta.org.au
-
- tvervaek@col.hp.com (Tom Vervaeke) writes:
-
- > How much force is exerted when the switch is moved? Locally
- > the track is controlled by the Sante Fe dispatcher #10 from
- > Albequerque, NM. I was sitting there thinking what would
- > happen if an animal or human had his foot in the switch when
- > it started moving. Would it be strong enough to cause serious
- > damage or is there a sensor to sense resistance? Also, how
- > fast do these things move?
-
- Here in Sydney, Australia, we have a large number of turnouts that are
- electro-pneumatically operated. To explain, the command from the control
- location activates a solenoid (that's the electrical part) which allows
- a feed of compressed air to an air motor that moves the switchrails (that's
- the pneumatic part). These things are damn fast! You can hear the switch
- rails bounce off the stock rails because the action is so fast. I imagine
- that anything stuck in between the switch and stock rails would not be
- in much of a state after getting squashed.
-
- Most of the other remotely controlled points are driven by geared
- electric motors. These are MUCH slower than the EP type, so I presume
- that they would also have a much larger compressive effect on anything
- in the way of the switchrail.
-
- When I was working in signalling before transferring to loco driving,
- I once got my foot stuck in a set of EP points. Fortunately for me I
- had steel-capped boots on, so while the boots were written off, my
- foor only sustained a few bruises.
-
- As far as obstruction sensors go, I've never seen any on all the railways
- I've visited here in Oz. If something's in the way, tough luck!
- --
- Craig Dewick | - Railway Preservation Industries -
- Send email to: | Supporting the Preservation
- craig@kralizec.zeta.org.au | of Australia's Railway Heritage
-