J C Lawrence
Is it possible to block another player's unfinished track?
Yes, but only within the normal legal track building rules of basic Age of Steam.
This usually happens when one player builds track next to a town hex and a second player blocks access to the town by building a tile that connects to the town, but not the unfinished track.
As in basic Age of Steam this is only legal if that town is already connected to track that connects to a city.
Is a player required to build a track in the town to be considered connected to the town before the coal can be moved?