Add a new rule to the ruleset, entitled Leaping:

If a player’s piece is in a station that is adjacent to another player’s piece, and they move by any legal means to the station on the same line that is adjacent to the same player’s piece on the other side, without that player having moved in the interim, then they have successfully leaped that player. A player may only leap another player as a weekly action; if a player cannot legally leap another player due to this restriction then they may undertake the actions that would normally constitute a leap, provided that they are otherwise legal, but that action is not considered to have been a leap.

Whenever a player leaps another player, they may remove one letter of their choice from that player’s trail.

Whenever a player moves their piece to a station that is at the end of a single line (i.e. any station that has only one other station directly adjacent to it - for example, Amersham or Morden, but not Ealing Broadway or Barking), they may add an asterisk (*) to their trail immediately before the letter that they would add for that station. If a player has an asterisk in their trail and are leaped then the leaping player must remove the asterisk instead of removing any other letter. An asterisk can be ignored for the purposes of making letter combinations in a trail (e.g. UNL*OCK would have the same effect as UNLOCK).