Hello everyone, one day I was having fun with SG2 on simvliet haven bridge loop track. I let it run in circles, then when I stopped the SG2 and wanted to leave it there staying I heard very loud groaning. It played for some seconds and then it cutted off and I could heard normal muted humming (when the train is powered from overhead wire or third rail and it's staying, you can hear a muted humming) I was wondering, "Why SG2 made that loud groaning? Wasn't that a system important for SG2? Why this groaning only sounds when the train is powered from overhead wire or third rail? Why only SG2 and MG2 (I discovered that MG2 does it too) make this sound?
For Michiel: I think, I dicovered an easter egg!
Is that an easter egg? (SG2, MG2 groaning sound)
Moderator: senjer
Is that an easter egg? (SG2, MG2 groaning sound)
If you want to make a very fast ride, just disable ATB/ZUB, put trottle to 1.00 and enjoy.
In my Avatar is a Logo of a Prague metro.
Sorry for my bad English. I am Czech and i am learning English
In my Avatar is a Logo of a Prague metro.
Sorry for my bad English. I am Czech and i am learning English
Re: Is that an easter egg? (SG2, MG2 groaning sound)
Thats the compressor of the train. They make this sound in real life. Because of that they had install couplers on the buffers at De Akkers.
- metroverslaafde
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- Joined: 08 Feb 2014, 13:32
- Location: Rotterdam
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Re: Is that an easter egg? (SG2, MG2 groaning sound)
Yes, it is a compressor. The doors on real the real MG2/SG2 close bij air pressure produced bij the compressor. To keep the doors closed the compressor needs to build up enough pressure to do so, that declares the sssssssssh noise when you close the doors, that is the airflow.
A video where you can hear the sound quite clearly:
https://www.youtube.com/watch?v=kviUHG_BXDk
A video where you can hear the sound quite clearly:
https://www.youtube.com/watch?v=kviUHG_BXDk
Re: Is that an easter egg? (SG2, MG2 groaning sound)
Also pressured air is used for brakes, that's the source of hissing sound when releasing them.metroverslaafde wrote:Yes, it is a compressor. The doors on real the real MG2/SG2 close bij air pressure produced bij the compressor. To keep the doors closed the compressor needs to build up enough pressure to do so, that declares the sssssssssh noise when you close the doors, that is the airflow.
A video where you can hear the sound quite clearly:
https://www.youtube.com/watch?v=kviUHG_BXDk
- metroverslaafde
- Posts: 428
- Joined: 08 Feb 2014, 13:32
- Location: Rotterdam
- Contact:
Re: Is that an easter egg? (SG2, MG2 groaning sound)
True, I forgot about that
Re: Is that an easter egg? (SG2, MG2 groaning sound)
Actually, it's the main use of compressed air, doors is only a side job.metroverslaafde wrote:True, I forgot about that
Re: Is that an easter egg? (SG2, MG2 groaning sound)
Actually these trains use electrodynamic braking by default, air brakes are only used at low speeds when the ED-brake is not efficient any more. And also the pantograph and third rail shoes are controlled by compressed air. This is the biggest loophole for these trains, if the air pressure is to low you have no power, and without power you cannot start the compressor to increase the air pressure. When this happens the trains requires 'CPR' to either manually supply it with power (the pole of the red flag below the third rail shoe does the trick, although I doubt it's very safe) or manually supply it with compressed air (basically using a big foot pomp) in order to get it up and running again.
Re: Is that an easter egg? (SG2, MG2 groaning sound)
I had to do that a number of times. But it's a failure and shouldn't happen too oftenMichiel wrote:When this happens the trains requires 'CPR' to either manually supply it with power (the pole of the red flag below the third rail shoe does the trick, although I doubt it's very safe) or manually supply it with compressed air (basically using a big foot pomp) in order to get it up and running again.
- Maronit
- Posts: 173
- Joined: 23 Feb 2015, 16:25
- Location: Noord-Brabant (North-Brabant), Nederland (The Netherlands)
Re: Is that an easter egg? (SG2, MG2 groaning sound)
Pun Intended?atimur wrote: doors is only a side job.
Glasgow underground FTW, the london one is nice too.
heb inmiddels gehoorschade volgens mij, vanwege vierkante wielen in de sim. -2.00 FTW
heb inmiddels gehoorschade volgens mij, vanwege vierkante wielen in de sim. -2.00 FTW
Re: Is that an easter egg? (SG2, MG2 groaning sound)
What is CPR? It's something like APU (auxiliary power unit) in aircrafts? Don't be surprised, I'm asking like that. I never have been in Netherlands and I'm not an engineer.Michiel wrote: When this happens the trains requires 'CPR' to either manually supply it with power
And Michiel: That's not an easter egg! I thought it is, but people here corrected me !
If you want to make a very fast ride, just disable ATB/ZUB, put trottle to 1.00 and enjoy.
In my Avatar is a Logo of a Prague metro.
Sorry for my bad English. I am Czech and i am learning English
In my Avatar is a Logo of a Prague metro.
Sorry for my bad English. I am Czech and i am learning English