Tonnage Ratinds and weather Reductions for locomotives
NW Mailing List
nw-mailing-list at nwhs.org
Tue Dec 18 20:16:39 EST 2018
On 12/18/2018 12:55 PM, NW Mailing List via NW-Mailing-List wrote:
> 3. And maybe decreased braking capacity due to leakage.
There is no such thing, at least not on a normal train [_/weird,
oddball occurrences or trains sitting without air for long periods of
time don't count for this narrative/_]. Quite the contrary!
If you don't know, unless a steam locomotive has at least a 24RL brake
system, it has no "Pressure Maintaining Feature". What that means is
that once an automatic brake application has been made to control the
train downhill, let's say a ten pound reduction from 75 lbs. to 65lbs,
the system has no way to maintain that 65 lbs. in the trainline.
Consequently, if there is any leakage in the trainline, the brakes will
apply even more. And, they will continue to apply and slow the train
even more than desired until a stop is made or the brakes are released
by the engineer. So, you can see the importance of having a tight trainline.
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