I forgot to sign off on the first post to your reply and forgive my spelling.
rich
-----Original Message-----
From: smokyjoe66 <js08ws62@sbcglobal.net>
To: CBQ@yahoogroups.com
Sent: Sat, Nov 14, 2009 9:47 pm
Subject: [CBQ] Railroad Freight Cars Moving on Their Own
It seems to me that everyone on this list is here because we admire, love, and
re generally curious about all the aspects of railroading. So, this question,
hough off-topic, might be of general interest to all, and of specific interest
o those who know physics.
Railroading began and continues to be a popular and effective way of moving
reight because a rolling steel wheel on a steel rail is very efficient. I have
een reports that an 8- wheel freight car rests on less than 2 square inches.
nd, it is steel on steel - little friction. Moreover, I am sure all of us have
itnessed the very long distances that a very slow moving freight car can roll
n its own. It is phenomenal. So… here's a theoretical question:
If an ordinary, empty, boxcar resting on 2 roller-bearing 4-wheel trucks was
iven a 50 mile an hour push on a perfectly level, perfectly straight railroad
rack on a windless day, how far would it go before stopping on its own?
It also would be interesting to hear some of your stories known from personal
xperience regarding long distances rolled by railroad cars moving on their own.
nother phenomenon worthy of comment would be just how silently they roll. I'm
ure many have stories about that, too.
-----------------------------------
Yahoo! Groups Links
Individual Email | Traditional
http://docs.yahoo.com/info/terms/
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/CBQ/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/CBQ/join
(Yahoo! ID required)
<*> To change settings via email:
CBQ-digest@yahoogroups.com
CBQ-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
CBQ-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|