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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!unixhub!fnnews.fnal.gov!fnal.fnal.gov!khartman
- From: khartman@fnala.fnal.gov
- Newsgroups: rec.railroad
- Subject: Re: Grade crossings, etc. (was Re: Deaths on Railroad Prop...)
- Date: 28 Dec 92 21:52:28 -0600
- Organization: Fermi National Accelerator Lab
- Lines: 27
- Message-ID: <1992Dec28.215228.1@fnala.fnal.gov>
- References: <1992Dec23.162343.29221@stsci.edu> <Bzq4B6.JHA@chinet.chi.il.us> <1992Dec27.042134.28739@cbnews.cb.att.com> <1992Dec27.064746.27037@netcom.com> <BzzA51.35C@specialix.com>
- NNTP-Posting-Host: fnala.fnal.gov
-
- In article <BzzA51.35C@specialix.com>, jim@specialix.com (Jim Maurer) writes:
- > tssmith@netcom.com (Tim Smith) writes:
- >
- >>There is an interesting situation on the CalTrain commuter line on
- >>the SF Peninsula. Just a hundred yards or so north of the San Mateo
- >>station there is a grade crossing guarded by gates. When a
- >>northbound train stops at the station, the gates go back up to let
- >>traffic through. When the train gives its two-toot highball, a sound
- >>sensor near the gates lowers them again. All this even though there
- >>is little traffic on the cross street, and a station stop rarely
- >>takes more than 45 seconds. Maybe it's a remnant of an old SP
- >>experiment.
- >
- > Actually, there are quite a few places on CalTrain with crossing gates
- > activated the same way. I think Milbrae is one.
-
-
-
- I have been interested in the methods used to "lift the gates" while
- a train is close to a crossing, but not moving. Setups that use the Diesel
- horn to activate the gates, or a slow moving train/timer.
-
- Can anyone give us a more technical view of how these different
- systems operate? Thanks for the information!
-
-
- Ken
-