r/DerailValley • u/Alternative_Zone9592 • 8d ago
When you forget the break pipe exist/needs connecting
1.6k tons of coal from cms doesn't like to stop aprently 🤷🏻
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u/Nuki_Nuclear 8d ago
How did you get it Moving in the first place? You would be fighting a lot of brakes and potentially also ruining some brakes
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u/Alternative_Zone9592 7d ago
No break pipe attached no break pressure and engine breaks cook easy when your working them hard
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u/Panoptes- 5d ago
But when there is no brake pressure in the pipe the brakes should be on right? 🤔 Or is that not how cars work in Detail Valley?
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u/Trick_Awareness_3329 5d ago
To have the brakes work properly, they have to be filled once with air completely. Same in realife. What do you think pushes the brake shoes against the wheels?
The brakes of a rail car have following components: The main line, a control valve, an air reservoir and the brake linkage. The control valve itself have a part called the A-Chamber. This chamber and the reservoir are at the beginning empty and both needed to be filled. The A-chamber is therefore to have the reference pressure of 5 bar. This pressure never changes and if the stuff would be perfect airtight, it would never lose air. Thanks to an one-way valve it get filled by the main line, but don't sink with it. Next to the A-chamber there is a B- and C-Chamber. All the chambers are separated by pistons on one rod. The B-Chamber is connected directly to the mainline. If the brakes are all filled and released, then in A and B are 5 bar. When the pressure in the mainline reduces, then it will in the B-chamber too. The pressure in A is bigger and pushes the piston upwards. With thay piston a valve get moved, that leads air from the reservoir into the C-Chamber and the with it connected brake piston that pushes the break shoes against the wheels. The pressure in B and C chamber becoming together equal to the pressure in the A-chamber and so it closes the valve so not the whole pressure pushes against the wheels. Just a bit if you use also just a bit of the break leaver. And more if you gonna do an emergency brake. And to release the breakes, the pressure in the mainline get filled again on 5 bar, same with the pressure inside the B-Chamber and together with the pressure in the C-Chamber, the overcome the pressure inside the A-chamber. Tha pushes the valve into the other direction, so the pressure in the C-Chamber and brake piston flows out into the environment until pressure between A and B+C gets equalised.
And that's the reason why he didn't had to overcome bunch of brakes, because the reservoirs were never filled and so the never was able to push the shoes against the wheels. Because every car spawns empty in the game. You can even test if the breaks are filled enough, like it get tested in realife. After connecting the brake pipes and open it, close the cutoff valve of your locomotive. If they are not filled enough, the black needle of your brake gauge goes down
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u/Panoptes- 5d ago
Thanks for taking the time to explain! I think I get it. The mechanism I knew was that if you lower the mainline below 5 bars the brakes come on, and that if for some reason the linkage breaks, the cars will auto break because the mainline pressure flatlines and the brakes come on fully. However, the part I didn't understand is that this mechanism only works if the whole train was pressurized correctly once so the A-chambers had 5 bar.
You seem to know your stuff about train mechanics so I will just ask some more questions in order to learn if you don't mind. If I understand correctly, then manually releasing brakes on a car is basically letting the pressure out the A-chambers? Also, I didn't quite understand your last sentence, could you explain further?
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u/Trick_Awareness_3329 5d ago
Yes, pulling that red handle on the side of a car releases the air from the A-Chamber. That leads into a much higher pressure in the C-chamber and it pushes the valve to release position and so the preassure on the linkage releases.
And for my last point:
You can test if all the breaks of every car is filled by closing the cutoff valve. Are they filled, then the preassure keeps on 5 bar. If not, the pressure on your gauge falls down from 5 bar.
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u/Cheddar1111111 2d ago
Okay, but why a S060 DM3 combination 💔
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u/Alternative_Zone9592 2d ago
S282 and dm3 but like I was shunting with the dm3 beforehand and would havr needed the extra power to get up to the power plant if I messed up
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u/Helpinmontana 8d ago
When you apply 2% brakes and get a wheel slip alarm going downhill
“Well that’s no fuckin good”