Pzb

Discussion in 'TSW General Discussion' started by ctlee#2068, Mar 21, 2023.

  1. ctlee#2068

    ctlee#2068 Active Member

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    20230321211617_1.jpg
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    In DRA Radebeul Ost to Dresden. I drive passenger.

    Photo1
    I prepare stop before red light. Now it become green.
    I speed up, but limit still down to 24, and EB...
    Should Limit not be 45? I found blue 85 became 70.
    Is it a bug?

    Photo2
    I load, this time I stop befroe 500hz, wait green.
    Green, release. Everything is normal.

    When must acknowledge be pressed?
    I thought only yellow light was necessary.
    But seem some flashing green light are, some are not. (what is flashing mean?)
    And it even "cause" 1000hz without light.
    Would it be better that acknowledge every green light?
    Is it need to release that start in station (in 1000hz)?
     
    Last edited: Mar 22, 2023
  2. hyperlord

    hyperlord Well-Known Member

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  3. redtrainz

    redtrainz Active Member

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    The 500 Hz limiter stays active until your loco has passed the signal. You'll see the light go out after the signal (and depending on the loco, it'll say "Zugbeeinflussung" to tell you the limiter is now off).

    Signals with speed restrictions usually must be acknowledged if the new speed is below 100 km/h. (That includes signal boards, not only light signals.) It's relative, though: if you current speed limit is 100 and the new speed limit is 90, then the magnet is normally not active and you don't need to acknowledge it - but better to do it anyway just to be safe. If your speed limit is 160 and the new limit is 90, then you'll probably have to acknowledge it, brake to 80, wait for the 1000 Hz light to come off and then speed up to 90.

    Here is Dovetail's own tutorial on PZB, LZB and German signalling:
     
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  4. TKessel

    TKessel Well-Known Member

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    To be exactly it stays active until you pass the next PZB Magnet which is usually with the signal.
     
  5. OpenMinded

    OpenMinded Well-Known Member

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    And to be even more precise, the 500Hz influence will stay active for 250m, regardless of another magnet or signal…

    Edit: to add to this, other magnets have nothing to do with switching off another magnets influence. In the instance of a main signal this would mean that the 2000Hz magnet would need to be active, which would then mean that the signal shows Hp0 (or red).
     
    Last edited: Mar 21, 2023
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  6. OpenMinded

    OpenMinded Well-Known Member

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    The way I interpret your question is that you are limited to 25, as you are in restricted mode. This will happen if you are in 500Hz influence and have stopped in between. Then you need to creep up to the signal, until the 500Hz extinguishes and you can speed up again.
     
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  7. ctlee#2068

    ctlee#2068 Active Member

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    The explanation on this page is simple enough.

    http://sh1.org/eisenbahn/rindusi3.htm
    As soon as we halt, or travel with 10 km/h or less for at least 15 s, the 500 Hz-induced speed limit is further restricted to 25 km/h...
    The signal then changes to clear. Since the 500 Hz-induced restrictive speed limit (i.e. 25 km/h) is still active...

    If I wait for green, which is better?
    A. Stop before red. Green, 25kph.
    B. Stop before 500hz. Green, release, 85kph.

    When the game start or load, it seem don't show what section I'm in.
    In fact I'm at 1000hz and ahead is green, but HUD no reminder to release, then speed up and EB.
     
    Last edited: Mar 22, 2023
  8. ctlee#2068

    ctlee#2068 Active Member

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    In my understanding, there are two kinds of 1000hz.
    1. Slow down: Active with flashing green, or without signal. No 500hz.
    2. Prepare to stop: Active with yellow, and notice 500hz.
    Is it right?
     
    Last edited: Mar 22, 2023
  9. Isaak

    Isaak Well-Known Member

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    Your train can't tell the difference between a 1000Hz for a "slow down" instruction (which can also be a yellow+green diagonal aspect) or for a "expect stop" instruction. As a driver you should handle according what the signal/speed restriction was showing. If a Vorsignal showed 'expect stop' (yellow/double yellow): make sure to reduce your speed to below 500Hz speed limits before driving over the 500Hz magnet (PZB O: 65km/h, reduce to 45km/h within 153 meters; M: 55km/h, reduce to 35km/h within 153 meters; U: 45km/h, reduce to 25 km/h within 153 meters). You should not acknowledge the 500Hz magnet.

    If you know the signal will become green soon (which in reality you won't know most of the time because you can't peek at the map), it's best to reduce to a little above 10 km/h as soon as possible, so you do not get into restricted monitoring and possibly avoid overrunning the 500Hz magnet while it is still active. This enables you to release immediately after the signal clears and increase speed to the maximum allowed speed without restrictions. Only release when you are 100% sure no further PZB magnets are active within about 500 meters.

    Any time you start driving a train after you activated PZB, restrictive monitoring is active by default. It's part of driver training to know that you should release from PZB monitoring before accelerating too fast. Only release if you have a clear main signal and you're sure no PZB magnets are active within 500 meters. You can recognise this by the 70/85 indicators alternating or the speed display showing a yellow bar with the maximum allowed speed in it. That's default behaviour. I've not used the HUD for years, so I don't know if it shows this to the user. You 'll get used to it.
     
    Last edited: Mar 22, 2023
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  10. Inkar

    Inkar Well-Known Member

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    I wouldnt describe it that way. A 1000Hz magnet is a 1000Hz magnet and it is always the same. What changes is the way the different kind of magnets are arranged to make sure the train is travelling at a safe speed in each situation.
     
    Last edited: Mar 22, 2023
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  11. solicitr

    solicitr Well-Known Member

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    When starting a German service I always just assume a 40 km/h limit until I get going and can ascertain otherwise.
     
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  12. ctlee#2068

    ctlee#2068 Active Member

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    SKW 69298
    20230330134049_1.jpg
    Should I press "override" until passing after green?
    Why is it not green?
     
    Last edited: Mar 30, 2023
  13. Isaak

    Isaak Well-Known Member

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    You shouldn't press anything if the light turns to a permissable color.

    If you have permission from the dispatcher and need to pass the signal at danger (red), you press 'override' (pzb befehl) while crossing the signal. The signal will stay red but you won't be punished for a SPAD. After that you can release (pzb frei) if you have a clear (green) signal only.

    Edit: didn't see the shunt signal on my phone. Correct answer: this is a shunt signal, meaning you have permission to pass at low speed, but are responsible to stop for any obstruction on your path, like another train, until you pass a main signal that gives a more permissable instruction (green, green-yellow...). You should press pzb befehl (override). The signal will turn red (without the white shunt lights) after you have passed it.
     
    Last edited: Mar 30, 2023
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  14. ctlee#2068

    ctlee#2068 Active Member

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    Shunt signal is one of red, but allow to pass?
    I think I understand PZB of three buttons.
    But not sure when is 1000hz active. Sometimes it don't need to press acknowledge.
    500hz seems only active before red?
     
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  15. Isaak

    Isaak Well-Known Member

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    A red main signal with two white lights is a shunt signal. It means the dispatcher is not sure that the route ahead is clear, but you have permission to proceed on sight.

    If you pass a VorSignal (that has a Vorsignaltafel (white plate with a black diagonal cross) below it - see here) that shows anything else than one or two green continuously burning lights, you should acknowledge with PZB Acknowledge. Also if you pass a yellow triangle with a speed limit below 10 (100 km/h), you should acknowledge. If the yellow 1000Hz light comes on, reduce your speed to be below the maximum allowed speed within the maximum allowed time (see wikipedia). If you are driving really fast, start reducing your speed before passing the signal, so you don't have to brake too hard to meet the speed limit in time. If you passed a double or single yellow signal (based on the signal type), expect a red signal (danger - stop) and keep decelerating so to not cross the 500Hz magnet (± 250 meters before the signal) above the maximum allowed speed (see same article). If the signal stays red: stop in front of it. If the signal clears: continue driving and acknowledge the signal if it also serves as a VorSignal (yellow downwards pointing arrow below the red plate on the signal post) and shows a restricting aspect.

    It looks very difficult at first, but once you get used to it you won't even have to think much about it anymore, and you'll get convinced that is a very helpful system that does a great job at preventing accidents compared to other safety systems.
     
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  16. ctlee#2068

    ctlee#2068 Active Member

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    Yellow and speed limit on distant signal: Acknowledge 1000 hz
    Same on home signal: It seem do not need to acknowledge?
    It's bad in TSW3 that the field of view is less than 300m. Driving a train at 160 and seeing a yellow light... Should I brake first or acknowledge first?
     
    Last edited: Mar 30, 2023
  17. Isaak

    Isaak Well-Known Member

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    At a home signal you don't have to acknowledge, unless it is combined with a distant signal (yellow plate on the signal post) and shows a restricting distant signal.

    At 160 km/h it's best to start braking as soon as you see that you'll need to reduce your speed or stop, before you pass over the signal and acknowledge. It is possible to slow down fast enough (to below 85 km/h in 23 seconds), but your passengers won't like it. If you're traveling below about 120 km/h (depending on the train you're riding), it is safe to only start braking after you've acknowledged, as you have enough time to decelerate in time and you gain some seconds by braking later if you're running on a tight schedule.

    What system are you using for TSW? I'm often able to see a distant signal at (more than) a kilometer before reaching it, unless the view is restricted by a curve or hill of course.
     
  18. solicitr

    solicitr Well-Known Member

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    Definitely start braking first. You have a window after passing the signal to acknowledge, and you should already be braking by the time you reach it.
     
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  19. ctlee#2068

    ctlee#2068 Active Member

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    I got EB here. Is it a bug?
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    What does "W" mean?
    upload_2023-4-3_16-6-58.png
     
    Last edited: Apr 3, 2023
  20. hyperlord

    hyperlord Well-Known Member

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    Last edited: Apr 3, 2023
  21. ctlee#2068

    ctlee#2068 Active Member

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    I found it's HL flashing green, limit 100 km/h. But this limit is not showed on HUD, and other limits never caused EB.
    I am confused, there seems to be 3 systems in DRA. The position of HL is opposite to HP&KS. Won't it make chaos?
     
    Last edited: Apr 3, 2023
  22. OpenMinded

    OpenMinded Well-Known Member

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    I assume it’s the GPA section, just ahead of where you are in your third picture. Even though GPA for a 100kph limit should measure you at 120kph, there are exceptions. It was discussed before that the GPA on DRA are those exceptions. The distance to the limit is shortened and the limit in this section is therefore reduced. Can’t remember the exact figure, though. But it looks like you are are at 116kph and your BC is at 0, hence you did not reduce until the GPA…

    It’s all part of PZB, hence, it’s only one system.
     
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  23. colinL

    colinL Well-Known Member

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    Its a shunting signal and basically means that shunters will have to wait for the agreement of the dispatchers (to shunt any further).
     
  24. ctlee#2068

    ctlee#2068 Active Member

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  25. OpenMinded

    OpenMinded Well-Known Member

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    Leipzig, BR261, in TSW?! Have I missed anything…

    No, I have not, it was just posted into the wrong forum… I am surprised to see all these TSC praising recently on this forum. Can you guys not do this over where it belongs?!

    But to answer the question I can answer with my TSW perspective, yes, PZB is usually switched off during shunting. The rule is that it has to be switched off if your shunting move takes longer than 30min.

    When you are shunting you would switch head and tail lights on.

    As the BR261 is not in TSW I have not looked at it and have no clue about how it operates it’s gears…
     
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  26. solicitr

    solicitr Well-Known Member

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    AIUI, you turn on front and rear lower marker lights, but top (head)lights only at night/in bad visibility. Or am I wrong?
     
  27. OpenMinded

    OpenMinded Well-Known Member

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    No, strictly speaking, you are correct. Fz1 is the official shunting signal on your loco (as described by you). However, many locos can not actually show this any more and you will find very often local requirements that will require you to switch to Zg1a (three white lights).

    Admitting, I don’t know the rules for Leipzig, but with Zg1a on both sides you are on the safe side…
     
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