No, they're really not. To me it feels as if they're making fun of us. Yes, that thing has train doors and I will try to buy those glass pieces, but that's about it. That is NOT a set that any sane person would want to part out for the train parts and since it's a rather expensive set due to it's app, the more interesting bits and pieces will end up being expensive on the secondary market. No train buffers, no train windows, no 6x28 train base in black... and I would be shocked, if the two bogie plates were black. Even that school bus would have looked way better with train doors and windows.
I just spent 200€+ on 30 tan train windows, because I noticed that prices seem to be going up towards the 10€ mark. I also ended up spending 60€+ for a full set (6 pieces) of large black train wheels, a few years ago. You still can't get them from B&P, even though they're in the new Hogwarts Express. That same Hogwarts Express that you're only allowed to buy five copies of. You may look at the picture of those wheels in the B&P listing all day long, but the "order" button is greyed out. Same goes for the tan train windows in the 10194 listing. I still need at least 16 bogie plates in black. They're 6€+/each nowadays, while the ugly yellow ones can be had for 0.65€/each. Stoked.