12-12-2012, 02:26 PM
Very happy that ayone does point out any error.
Flashing greens are rare, that used when a line signalled for say 125mph is used for 140mph trains which need an additional section in which to brake. I thought that really just used experimentally for trials, but may be wrong. Rather surprised re use for freight trains- however I no longer work on such railways and may not be completely up to date wih all standards, so perhaps the use has been extended to other circumstances of which I am unaware making an effective 5 aspect signalling system with the sequence G-FG-YY-Y-R where certain trains treat the FG as if it were a G whereas others with longer braking (either because they are fast or because they have worse braking) need to treat as a caution; however this seems such a change that I would have felt that I would have heard of something that substantial.
Flashing greens are rare, that used when a line signalled for say 125mph is used for 140mph trains which need an additional section in which to brake. I thought that really just used experimentally for trials, but may be wrong. Rather surprised re use for freight trains- however I no longer work on such railways and may not be completely up to date wih all standards, so perhaps the use has been extended to other circumstances of which I am unaware making an effective 5 aspect signalling system with the sequence G-FG-YY-Y-R where certain trains treat the FG as if it were a G whereas others with longer braking (either because they are fast or because they have worse braking) need to treat as a caution; however this seems such a change that I would have felt that I would have heard of something that substantial.
(12-12-2012, 08:04 AM)jenni.joseph9 Wrote: Hi,
I dont mean to Point out the issue.. I was just searching for Flashing Yellow and Flashing green aspects.
I have studied the Flashing Yellow aspects in standards but could not find out Flashing green. Can some one help me with that, please.
I have seen this Flashing green aspect on Main line for Freight trains.
Thanks & Regards
PJW