On a recent Saturday morning, I had dropped my wife off at work and was driving home when the gates came down on the BNSF line running through Oklahoma City to Dalles/Fort Worth. Turned out it was the Heartland Flyer going by on its morning run to Fort Worth.
As I was waiting I noticed multiple cars on a siding with what appeared to be a air hose running from the air hose coupler on the lead box car to a grey box next to the siding. My google searches have not turned up anything except the 2012 BNSF manual for employees(addendum) and I will very readily admit I am most likely doing incorrect searches.
Was(is) this air hose used to keep air pressure up on the brake line? If not a air hose then its purpose?
If so, is this a common practice that I have seen for the 1st time?
Why? Safety? Less time to charge line when connecting to engine?
If the above is true, may I assume that even with the brake line charged you would still have to set a number of hand brakes?
Thanks,
Tim