Change the title of the rule, “Locked Stations”, to, “Locked and Sealed Stations”.
Change the text of the rule, “Locked and Sealed Stations” to the following:-

A Player may never move their Piece to a Locked Station. If a Player’s action would require them to do so, they must instead relocate their Piece to the position “Off the Board”.

The following stations are locked:

* Oxford Circus
* Kings Cross St. Pancras
* Embankment
* Boston Manor

Any Station which is not Locked or Sealed is considered Open, and may also be referred to as Unlocked

Additionally, Mornington Crescent is a Sealed Station.  No Player’s Piece may be moved to a Sealed Station.  If a Player’s action would require them to move their Piece to a Sealed Station, they must instead relocate their Piece to the position “Off the Board”.  Sealed Stations may not be unlocked by the Trail UNLOCK.