Add a new rule to the ruleset, entitled Trails:

Each player has a Trail, which is tracked in the GNDT. A player’s trail is a sequence of up to seven letters, with each letter being the first letter of a station that player has recently visited. Every a player’s moves their piece to a new station, that player must immediately add the first letter of the new station to the end of their trail; similarly, if a player ever moves another player’s piece to a new station, they must update that player’s trail in the same way. If this would cause the trail to contain more than seven letters, the oldest letter is removed.

When a trail contains a certain combination of letters in order, the player who possesses it may undertake certain specified actions. When such an action is undertaken the letters used to undertake it are removed from the trail. These are detailed below:

* BOAT. If a player has a trail that contains the word BOAT, then they may immediately move their piece to any station that has a boat next to its name on the map.
* UNLOCK. If a player has a trail that includes the word UNLOCK, they my cause one locked station to no longer be locked. To do this they must make a post to the blog stating that the station has become unlocked; the station is considered to be unlocked from the moment that the post is visible on the blog, but an admin should change the ruleset or gamestate to reflect this change as soon as is practically possible.

Delete the second paragraph of rule 2.2, and add the following as a new rule, entitled Locked Stations:

A player may never place their piece on a locked station. If a player’s move would require them to do so then they must instead place their piece Off the Board.

The following stations are locked:

Mornington Crescent
Oxford Circus
Kings Cross St. Pancras
Embankment