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- Newsgroups: rec.railroad
- Path: sparky!uunet!usc!rpi!batcomputer!cornell!parmelee
- From: parmelee@cs.cornell.edu (Larry Parmelee)
- Subject: Re: Torpedos (was: Incident on Boston (MBTA) Commuter Rail)
- Message-ID: <1992Dec22.134651.13223@cs.cornell.edu>
- Organization: Cornell Univ. CS Dept, Ithaca NY 14853
- References: <RMURA.92Dec17145416@world.std.com> <EMERY.92Dec17170944@dr_no.mitre.org> <tgttgv.725013815@tb3.chem.tue.nl>
- Date: Tue, 22 Dec 1992 13:46:51 GMT
- Lines: 58
-
- In article <tgttgv.725013815@tb3.chem.tue.nl>
- <tgttgv@chem.tue.nl> quotes emery@dr_no.mitre.org (David Emery)
- who writes:
- > >Could the loud "pop" be a torpedo?
- > > dave
-
- If it were a torpedo, most likely there would have been two of them,
- and I'm not sure one would hear them at all unless one were within
- a few cars of the front end (assuming modern, fully enclosed passenger
- equipment, no windows open, etc). All the railroad rules I'm familiar
- with require torpedos to be placed in pairs. If the sound was more of a
- "POP-HISSSSSssssss......" my guess would be that it was an emergency
- brake application, because you would hear this on every car as that
- car's brake equipment reacted to the drop in brake pipe pressure.
-
- In article <tgttgv.725013815@tb3.chem.tue.nl>
- <tgttgv@chem.tue.nl> writes:
- >
- > Could someone please expain to me what a 'torpedo' is ?
- >
-
- It's a little package of explosive, about 3cm (1.25 inches) square,
- flat on one side with a little mound on the other, with two metal
- straps sticking out of opposite sides and sandpaper on the bottom
- (flat) of the package. The length of the thing including the metal
- straps is about 15cm (6 inches), maybe a little more.
-
- +---------+
- Top view | |
- +------------------------+ +------------------------+
- | | | |
- +------------------------+ +------------------------+
- | |
- +---------+
-
- _
- Side view _--" "--_
- -------------------------[_________]-------------------------
-
-
- It is applied to the rail by placing the sandpaper side down on the
- center of the rail head (the sand is there to help hold the torpedo in
- place when a wheel hits it), and bending the metal straps over the rail
- head to hold it in place. When a wheel hits it, it explodes with a
- loud bang.
-
- Torpedos are typically used in situations where a train has to make
- an unscheduled stop. In the most common senario, where you have to
- "protect" against a following train, a crew member would walk back
- a prescribed distance from the rear of the train and place two torpedos
- on the rail about 25 feet apart (simplifying somewhat).
-
- When an engine crew hears a (one or more) torpedos explode, they're
- supposed to stop the train as quickly as possible, then (generally)
- proceed at restricted speed (able to stop within 1/2 the sight distance)
- for a prescribed distance before resuming track speed.
-
- -Larry
-