J C Lawrence
In our first Game session we noticed that some tracks can never build. For example if all yellow tiles with a large town where build no other town can be connected by tracks because its only allowed to build yellow tiles directly on the board.
Correct, however the already placed #57 can by upgraded to #14 and #15 green city tiles, thus freeing the #57 to be used elsewhere.
Same can happen with Tiles which have a Lettercode. For Example OO (the Board has 4 possible locations for OO tiles) If both green OO tiles where build, all the other towns on OO field can never be connected by tracks?
Yes, until one of the green #54 tiles has been upgraded to brown, thus freeing the #54 to be placed elsewhere.
...the Starting region of the "Erie" is also an OO field. What happened if all the green OO tiles where build before the Erie is founded?
Then the Erie cannot place a tile or its home station until a #54 becomes available. It may place a station marker elsewhere and run trains via the D&H private of course, or could just be suitcased.
Have I overseen something?
Yes, that upgraded tiles are returned to the supply for re-use.