27-05-2015, 03:58 PM
Hi,
Thank you for taking the time for such a comprehensive and helpful reply. I've just got a couple of points that I was wondering if you could elaborate on?
Is the fact that points redrive has occurred communicated to the interlocking? I'm imagining the scenario where a train is over a set of points and the point lose detection, redrive occurs and everything is ok. However, maybe due to the poor track quality in this particular area excessive track vibrations mean that this scenario is occurring a lot. Is there any way that the maintainer or the signaller will know?
Also can you explain the statement you made "Re-drive really makes no sense with point machines such as the 63 or HW since even if voltage is applied to the terminals of the machine then will never reach the motor if the point is fundamentally in the desired position because the cut-off contacts won't be making at that end of the stroke"? I'm not very familiar with these point machines, are you assuming that the points have lost detection but the switch rail has not moved far enough for redrive to be effective?
Many thanks for your help
Thank you for taking the time for such a comprehensive and helpful reply. I've just got a couple of points that I was wondering if you could elaborate on?
Is the fact that points redrive has occurred communicated to the interlocking? I'm imagining the scenario where a train is over a set of points and the point lose detection, redrive occurs and everything is ok. However, maybe due to the poor track quality in this particular area excessive track vibrations mean that this scenario is occurring a lot. Is there any way that the maintainer or the signaller will know?
Also can you explain the statement you made "Re-drive really makes no sense with point machines such as the 63 or HW since even if voltage is applied to the terminals of the machine then will never reach the motor if the point is fundamentally in the desired position because the cut-off contacts won't be making at that end of the stroke"? I'm not very familiar with these point machines, are you assuming that the points have lost detection but the switch rail has not moved far enough for redrive to be effective?
Many thanks for your help