At the end of the canal phase all 'level 1 industry' tiles are removed. Does this include level 1 shipyards?
If so - then why does the level 1 shipyard tile not have a canal marker on it, like all the other canal-phase-only tiles?
(EDIT for future clarity: The canal symbol is missing on first edition copies of the game. Thanks to Xi Huan for this info.)
I know that level 0 shipyards need to be developed before any can be built, and that level-2 shipyards can only be built during the railway phase. Level-1 shipyards seem to fall into an ambiguous hole. Only one can ever actually be built, the Liverpool one, because of the coal connectivity requirements. This half suggests it could stay there when the railway phase is started.