Hi folks, firstly many apologies if this is the wrong place to post this and secondly excuse my ignorance. I know very little about the railways, so...
From an A40 slip-road I often see this circular brick structure by the Central Line, just west of White City. It's actually directly under the A40 fly-over over Wood Lane.
http://img304.imageshack.us/img304/2540/dsc002854hl.jpg
Now, I just can't help wondering - what the heck is it??
Or is more A40 related than Central Line perhaps....?
Cheers!