Board Game Arena

OK, help me out here. I select moving forward on the St. Petersburg line, give me an advantage, take the card/end game that gives me 4 actions (industry, 2x, black rail, 1 repeat of my choice). It supposedly puts the 2x out automatically, then I advance the industry and the black rail on St. Petersburg. 2 things: 1, I cannot figure out how to activate the 2x (it does not apparently add it and the 2x on the board isn't an activation option), and 2. I cannot activate the extra industry (which is 5 more points). Further, it won't let me continue because I haven't executed all my actions. What am I missing? There are significant points here (10+5 or so more for doubled rail advances).

It appears that the issue was that you cannot stack the 2nd industry. That was the only logical conclusion I could come up with.

Yep. You can't put the 2nd industry marker in the same spot.