Britain boasts an incredibly efficient and user friendly train system. For example, from London there are no less than twenty trains a day heading to Edinburgh. Even on the Friday of our departure, the busiest day to travel from London, and with an “incident” on the track causing massive delays, we still were able to arrive at King’s Crossing with just our Britrail Pass (a sort of automatic standby ticket) and leave for Edinburgh in less than forty minutes. No reservation necessary.