On Mon, 03 Sep 2007 11:47:02 -0400, David of Broadway
wrote:

But at least someone familiar with the overall Piccadilly line can
understand the east-west nomenclature. As can, for that matter, someone
familiar with the overall District line. But an east-west nomenclature
obviously makes no sense for the Circle line as a whole, nor does it
make sense at that particular point on the line.

The alternative is to have the line diagrams say something like
"District line Westbound and Circle line Anti-clockwise" - which would
also confuse some people, no doubt...