not sure if i understand the rules completely, nor have i read the hole forum post, but as i would understand it, if you have a steam but not an engine, then you lose 1 army right?
i don't think that happened in this game.
Game 9802792
maybe i'm wrong, but in case you'd like to check it out.
i was planning on trapping pink with the steam and getting him a -1, instead, i could have gone for the bonus.
EDIT;
after reading the rules a few more times i see now that there is no problem other than my comprehension skills.
disregard my concern.