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Re: [CBQ] Diesel Nose Hoses

To: CBQ@yahoogroups.com
Subject: Re: [CBQ] Diesel Nose Hoses
From: amtrak347@aol.com
Date: Tue, 15 Jun 2004 00:33:54 EDT
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Bob -
 
Think SIAM from the outside towards the coupler:
 
    S - sand (usually on older units with pneumatic  sander; both sides must 
be coupled for
        forward & reverse  sanders to work) normally 0 psi in these hoses
 
    I - independent brake, application and release  (this is the engine brake 
only) 45 psi with
        engine brake applied
 
    A - actuating (used to release engine  brake during a train brake 
application [power braking
        normally 0 psi
 
    M - main reservoir equalization (130-140 psi at all  times)
 
Electro-Pneumatic sanding eliminated the need for the two outside MU  hoses.  
Passenger capable units had a second hose under the coupler which  was the 
signal line.  E-units used in suburban service had a third hose  under the 
coupler which was for "straight air" train brake applications from a  24RL 
brake 
valve.
 
Amtrak units have a second hose under the coupler which is MR pressure used  
on the passenger cars for the water raising system (toilets, sinks, showers,  
diners, lounges)
 
I have been told by an EMD electrical engineer that the SD-70MACs can be  
entirely MUed thru the 27 point MU cable and not use any of the MU hoses.
 
Hope this answers your questions.
 
Bob Campbell
 


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