Both of them, and more. All class 1 railroads operate with members of the same unions. Right now the members of smart and the blet are voting on whether or not to accept the contract. It's mainly a threaten to strike over access to reasonable time off for things like doctors appointments. I just had to cancel a doctor's appointment that was scheduled 2 months ago because it would have taken toonmany of my "points" to make it. Wages aren't the sticking point for our union.

Source: I am a SMART member and just voted the other day.