All “service information” signs should be like this.
This was spotted at Tufnell Park by Talia Kraines.
Best bit: the amount of effort put into drawing the Doctor. And look at the date!
And the text? It's a quote by Steven Moffat from the Doctor Who 50th anniversary celebration.
Well done, TFL. Capaldi is really proud of you.
BBC / Doctor Who / youtube.com