1. "Emil only blocks spaces that you can use"
How about a space where I haven't got enough workers for? I.e. I would need two workers but I have only one left. The example doesn't seem to imply this, but it is a space I can not use...
2. "Emil collects locomotives and engineers"
Does Emil collect a factory when choosing the "take a locomotive + factory"-action (= 2 locomotives?). Or only a locomotive.
1. Since you can't use it, Emil will skip that. Even if the rulebook is a bit vague there, thematically it makes sense that Emil will skip this, as he doesn't block you somehow.
2. He takes two locomotives, just like a human player. He just doesn't care if he'll use them. Afterwards, he goes to pee.