Dec31*   Highgate High Level northbound tunnel [Mackenzieblu]

http://www.sucs.org/~cmckenna/photos/quizes/tq2/December/Dec31.jpg
http://www.sucs.org/~cmckenna/photos/quizes/tq2/December/Dec31sm.jpg

Question:
[url=http://www.sucs.org/~cmckenna/photos/quizes/tq2/December/Dec31.jpg][img]http://www.sucs.org/~cmckenna/photos/quizes/tq2/December/Dec31sm.jpg[/img][/url]
(click for a larger version)