"Alan (in Brussels)" wrote in message
...

So I suspected the double-arrow symbol might be just a relic.

No, the double arrow is still used on road signs, even those pointing to
brand new stations, and it is also used in conjunction with the underground
roundel in brand new totems outside old interchange stations.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes