What do double yellow lines mean?

[whole diary]

[grahame]

I know that a single yellow line on a platform means "stand behind this line until you train has stopped", but what does a double yellow line mean?  I see one in a picture in BMN's quiz at Wokingham - http://www.firstgreatwestern.info/coffeeshop/index.php?topic=11617.0 ... Stand behind rear line for approaching electrics and front line for approaching diesels, perhaps?  Or is it to stop people parking cars on the platform?

[Tim]

I've seen this at a few places.  Maybe standards have changed?  I am surprised at how many people ignore these lines anyway

[paul7575]

Lines have been used for more than one reason, that's the problem.  In the days of slam door stock a yellow line could be painted simply to keep you away from opening doors.

According to the current Railway Group Standard they are needed at 1500mm from the edge if passenger trains pass at more than 100 mph, or if freight trains pass at more than 60 mph (as they cause significantly more turbulence).  Hence very many examples that you see are not actually required, such as at Reading P7 - where they are constantly telling you to stay behind them...   

Section 9 of:  http://www.rgsonline.co.uk/Railway_Group_Standards/Infrastructure/Railway%20Group%20Standards/GIRT7016%20Iss%204.pdf

I guess a major problem is they are so difficult to remove if not needed.

Paul

[BerkshireBugsy]

Lines have been used for more than one reason, that's the problem.  In the days of slam door stock a yellow line could be painted simply to keep you away from opening doors.

According to the current Railway Group Standard they are needed at 1500mm from the edge if passenger trains pass at more than 100 mph, or if freight trains pass at more than 60 mph (as they cause significantly more turbulence).  Hence very many examples that you see are not actually required, such as at Reading P7 - where they are constantly telling you to stay behind them...   

Section 9 of:  http://www.rgsonline.co.uk/Railway_Group_Standards/Infrastructure/Railway%20Group%20Standards/GIRT7016%20Iss%204.pdf

I guess a major problem is they are so difficult to remove if not needed.

Paul

Am I dreaming or have the reading p7 "please wait behind the yellow lines" announcements only been in place since space on p7 was reduced by the hoardings ? I don't use p8 but are there equivalent announcements there ?