Dave H. Painted side goes up. My website : wnbranch.com
QUOTE: Originally posted by BentnoseWillie Air-brake equipped trucks are the same way - too many application/release cycles too close together and you're riding a sled till the reservoir(s) are filled. Think about that the next time you pass a truck on the road and give him a bit of extra room when you pull in. [B)] Al Krug's site (linked in a post above) is the best explanation of how train brakes work that I've ever seen. There's a great piece on signalling too.
QUOTE: Originally posted by Leon Silverman I thought Air brakes on trains worked the same way Truck and Bus Air brake systems work, namely, air pressure is built up to RELEASE the brakes, not apply them.
USAF TSgt C-17 Aircraft Maintenance Flying Crew Chief & Flightline Avionics Craftsman
QUOTE: Actually that is only half right. 18 wheelers use a air compressor to generate air which is filtered and sent to the dry tank. That tank is the supply for the braking system. On each of the 10 wheels (Not 18 -remember we are dealing with duals on a wheel) the brake pads (Or discs) are applied using air pressure to remove force from a spring that is extremly powerful. There is a spring inside the chamber that always "Wants" to apply the brakes. If you over come the pressure with sufficient air you will release the brakes.
QUOTE: Originally posted by BentnoseWillie QUOTE: Actually that is only half right. 18 wheelers use a air compressor to generate air which is filtered and sent to the dry tank. That tank is the supply for the braking system. On each of the 10 wheels (Not 18 -remember we are dealing with duals on a wheel) the brake pads (Or discs) are applied using air pressure to remove force from a spring that is extremly powerful. There is a spring inside the chamber that always "Wants" to apply the brakes. If you over come the pressure with sufficient air you will release the brakes. Oops. Guess I know more about train brakes than truck brakes...[;)]
QUOTE: Originally posted by BNSF railfan. Ok I now understand now. But here is another Question? Like some Railyards across America..... In most cases, When there is no Power Coupled to the waiting Train on the departure Track,there is a Hose running up to the first car of the Train that has no Power. The Hose that is connected to the cars Brake Hose,Is it call,Pre-tested? Like down in the BNSF Gibson Yard BNSF Pre-tests their Brake pipe for their Intermodel Trains. Allan.
23 17 46 11
Carl
Railroader Emeritus (practiced railroading for 46 years--and in 2010 I finally got it right!)
CAACSCOCOM--I don't want to behave improperly, so I just won't behave at all. (SM)
QUOTE: Originally posted by HighIron2003ar QUOTE: Originally posted by BentnoseWillie QUOTE: Actually that is only half right. 18 wheelers use a air compressor to generate air which is filtered and sent to the dry tank. That tank is the supply for the braking system. On each of the 10 wheels (Not 18 -remember we are dealing with duals on a wheel) the brake pads (Or discs) are applied using air pressure to remove force from a spring that is extremly powerful. There is a spring inside the chamber that always "Wants" to apply the brakes. If you over come the pressure with sufficient air you will release the brakes. Oops. Guess I know more about train brakes than truck brakes...[;)] I dont know much about train brakes =) But I do know a "Big Hole" when I hear one. You know those air line couplings that auto mechanics use for thier air tools? "**SNap wheiiirr! We have the same thing in specific areas on trucks. The tow driver simply brings a 100 foot coil of hose and connects the dead truck to his own rig's air system. Presto both have brakes. I understand that different forms of towing might not actually have functional brakes on the towee but I leave the fine points to the towers to tell. I heard tell of a friend who suffered a break in his air line. he simply stripped a bic pen down to the plastic tube, put both ends of the severed rubber hose that supplies the air onto it, clamped it and off he went. Upon review of the writing I used the term "Dry tank" here is a twist on the dry air and wet air. Air is taken in and used by the compressor to generate a charge in the holding tank. Ideally you want this air to pass thru the wet tank, to the filter and finally to the dry tank. The wet tank fills over time with oil, grease, sludge and well.. water. Ideally you drain this out nightly while you sleep. Failure to drain (Or use a in-line filter) will cause your spring brake chambers to be contaminated. Eventually the rubber seperating the springs from the pressure area will deteroiate. I think that Trains will have electric brakes before truckers do.
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