Re: [CBQ] Collision Video

["ryan.harris@sbcglobal.net [CBQ]" <CBQ@yahoogroups.com>]

If the locomotive is equipped with a dynamic brake holding feature (nearly all 
road service locomotives are), you don't lose dynamics when the train is in 
emergency (you lose throttle). The loss of air causes the independent brakes to 
set up quickly around 100 psi (typical full application of independent is 72 
psi). Since your locomotives each weigh around twice what the loaded cars 
weigh, the tendency is for the train to bunch up violently behind the motors. 
So when you go into emergency you bail off the independent and feather it to 
neither outrun nor bunch the train, allowing the train to bring you to a 
controlled stop. You can also use dynamics to control the slack in emergency 
which may be appropriate depending on terrain or speed. This is done to keep 
the train upright and in line on the rails to avoid creating a problem with 
poor train handling. It could be the difference between getting an air hose on 
a crossing and a big hazmat spill.

Ryan H 
Fort Worth TX 

------------------------------------
Posted by: ryan.harris@sbcglobal.net
------------------------------------


------------------------------------

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:
    https://info.yahoo.com/legal/us/yahoo/utos/terms/