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Reading Topic #16526
Ok here is one thing about msts that I dont know is possible...when you apply air brakes it there a hiss_____delay______hiss continued in real life? If it is just a constant hiss then is ther a way to fix this?
Marcus James MJ
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When you apply the brakes you should hear the air being vented from the brake pipe.On older locomotives this is pretty loud. Not so loud on the new stuff.The length of time you would hear this air being vented depends on how "deep" of a set you put on the automatic and how long your train is. The deeper the set/longer the train. the longer you will hear air being vented as a alrger volume of air has to be expelled.Once you have your set in the trainline, the automatic valve will generally be quiet for a while. Then, it will start a different kind of hiss.(Only the older ones are audible for this part. But not the really old ones. They didn't have pressure maintaining.)) What you would be hearing then is the pressure maintaining feature. This feature keeps the trainline from slowly bleeding down due to leaks in the system. It keeps the air pressure constant at whatever the set is by allowing a controlled amount of air into the trainline through the automatic brake valve.If the trainline was to slowly bleed down, your brakes would slowly keep setting harder and harder.This is a pretty basic explaination. Try a search for air brakes and see if you come up with something a bit more in depth.Todd Jones
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The above is pretty accurate. On older brake systems, (like on some steam engines- the Train Artisan USRA Mountain is a good example) you should hear air venting from the brake pipe as long as your automatic is in the "service" position, and as long as there is air left to vent. Watch the brake pipe needle go down. When it gets to your target reduction (say 70 or 80 psi) you would then put the automatic brake in the "lap" position. This prevents any more air from leaking out from the brake pipe through the automatic brake, however, it also does not allow new air to be pumped into the system. If there is a leak elsewhere in the system, you will notice the needle continue to fall. During an initial terminal air test, one of the goals is to determine the amount of leakage in the system over the time of the brake test. If it's too much, then the problem (usually leaky gaskets where the hoses hook together) must be fixed before the train departs the terminal. (That's our rule, anyway...) The way to fix this is to modify the sound configuration files for the locomotive.
- DISPATCHER 618
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Marcus,You said"Ok here is one thing about msts that I dont know is possible...when you apply air brakes it there a hiss_____delay______hiss continued in real life? "The reason for the two hiss sounds is that in real life the driver (engineer in US) does not vent the brake pipe directly, else he or indeed she would need to hold the brake handle in apply for a period proportional to the train length. What the driver really does is to vent a small air reservoir called the Equalising Reservoir, this give the driver a feeling of consistancy in brake handling. Following the reduction in pressure in the Equalising Res, a vavle called the Equalising Discharge Valve starts to vent the brake pipe until the presure of the brake pipe is equal to the Equalising Res. That's why there are two hiss sounds. I don't think MSTS replicates this so well.Alan
Hotmetal
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Hi,If you go to the File Library, in the Tutorials section, there is quite a good tutorial on air brakes - well worth downloading. This is quite an extensive document, with links to other material. It makes some attempt to provide both the "real life" workings and the MSTS implementation - especially the latter.There is also a short tutorial on vacuum brakes - not as well written or extensive as the air-brake tutorial, but still useful.CheersJohn
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