Mind the Gap!

"Mind the gap" is a warning to train passengers to take caution while crossing the gap between the train door and the station platform on the London Underground (Tube). You'll hear pre-recorded messages as you leave the train and see it written on the station platforms. I remember when I first arrived in London, it seemed hilarious to us Americans.

London's extensive Tube system has color-coded routes, clear signage, and many connections. Trains run out into the suburbs, and all stations are marked with the London Underground circular symbol. (Do not be confused by similar-looking signs reading "subway"—in Britain, the word subway means "pedestrian underpass.") It's also the best way to get around London.

Some lines have multiple branches (Central, District, Northern, Metropolitan, and Piccadilly), so pay attention which branch is needed for your particular destination. Do this by noting the end destination on the lighted sign on the platform, which also tells you how long you'll have to wait until the train arrives. Compare that with the end destination of the branch you want. When the two match, that's your train.

For single fares paid in cash, a flat £4 price per journey now applies across all six zones, whether you're traveling one stop or 12 stops. If you're planning several trips in one day, it's much cheaper to buy a tourist Oystercard or Travelcard, which is good for unrestricted travel on the Tube, buses, and some overground railways for the day. The off-peak Oystercard fare for Zones 1-2, for example, is £1.80. The more zones included in your travel, the more the Travelcard will cost. For example, Kew is Zone 4, and Heathrow is Zone 6. If you're going to be in town for several days, buy a seven-day Travelcard (£25.80 for Zones 1-2, £47.60 for Zones 1-6).