Over here, one sometimes hears people ask for a pint of black and tan* - I have yet to hear anybody ask for the alternative - though, I suspect I've been served it a few times...
* this would be a half and half over there, for obvious reasons...
I have six of the Hornby lit Pullmans* - there's a fair drag from all the pick-ups - running a supply from the front may be a good idea for that reason also.
*or Pullmen, who knows..?
The sign on the pillar seems a little bit superfluous. You would nearly have to get out to read it.
Still the bridge itself is fairly noticeable - and the upstairs passengers must have reacted pretty sharply...
Bridge strike in London - seven people on the top deck at the time, but only minor injuries, apparently.
http://www.bbc.co.uk/news/uk-england-london-33584494