Hi guys, I wanted to ask you if you can explain the difference between the P,R,G brake. And even when to overcharge the brake thank you very much
I'm not sure which brakes you are referring to and on what locomotives, but i can say that overcharging the brake is used when the air brake hasn't fully released because it is stuck somehow. Using the overcharge increases the air brake pipe pressure slightly in order to try and get the brakes to release. This is my understanding and I'm no expert. Hope this helps TLDR/Simplified, the brake overcharge forces brakes that are stuck on to release.
Speaking from experience with classes 37/47/20 sometimes you get brakes which go to "running" but still apply a slight brake pressure. Using overcharge or "past release" seems to rid this issue. WIthout it you gradually slow to a halt when trying to coast
I know they are on German locomotives. All I know is that they depend on the weight of the train and what you are hauling. It determines how quickly or not to apply and release brakes. I've heard overcharging is when you want more brake pressure if you can't get the train moving, but then you have to wait until it goes back down to normal. This was mentioned in like the 363 stream for tsw2 and the brakes were mentioned in the riesa Dresden stream I think.
R, P and G are different brake timings used on German trains. R is Rapid, P is Passenger and G is Goods (Rapid, Personen and Güter). If you look on the frame, you can see the brake weights that apply to each mode for this locomotive ("E+" entries refer to each brake timing making use of electric actuation instead of straight brake pipe depresurization). (Gotta say, I'm pretty proud of those markings, which were all done by hand including fabricating German-style numerals)
