Imperial
Can an army use the railroad through an occupied province, or rail into one and attack?
The rulebook's suspension rule blocks passage, and several posters agree on the rail attack inside the home country.
Not through one. A hostile-held province suspends the rail, so a unit cannot pass through it, and rail cannot take a unit back into its home country to attack from there. A unit that starts its move inside its home country and has not crossed a border may rail into an occupied home province and attack.