I like this slot it is entertaining at least and with intriguing bonusplay. But it comes with a certain risk, what happens is as follows if you have a bad day with the RTP on your account.
So, you have "invested" a lot of money on building houses and collected all train stations and works, during this time your balance most likely went down, perhaps a lot, because bonus doesn´t trigger, just a lot of dead spins. Well eventually, you think it will trigger and give you some decent return because you have "everything". This may not materialize as expected. If the slot or account is cold, when the bonus is triggered it will produce a lot of dead or low-paying spins, if you are lucky it will not take your houses if you are unlucky it will take some of your houses.
Usually after a bad bonus round in this case, you will have some houses left, (since you dont get any winning moves in the game, one is stuck same place),,, so you go for a second round, but now you have to collect all the train and works again. This time however if you are unlucky, it will take a lot of time to get these (and drain your bank roll even more) OR which is more likely this time the bonus will trigger prematurely and with 10 spins and 1x multiplier you will not get far usually, you may even lose rest of your houses. You have to start over, most of your "investment" into the board is gone.
During the same session, different rounds on different bet sizes may play a bit different, one may get stuck on a certain level and it is important to quickly identify "rotten" rounds and have stop loss limit.