If a few changes were made a very slightly different version of this game I bet would be distributed to young people in schools and youth groups across the world -- and be really popular with the teachers as well.

1) Tie the location of a contractor to a fixed set of train fuel sources, but never the 'reputation level' of a train. The most distant contractors from the station accept only diesel, the nearer steam and diesel, the closest electric only. You get the idea. Tie it a little bit more to 'the real world of trains'. Actual people who order things do not care whether it arrives on a 'wow looking train' or an 'ugly' looking train.

2) Cause contractors at locations to only order items of reasonable potential use at the delivery location. No more banks ordering livestock, apartment buildings ordering copper ore, etc.

3) In exchange for not having different repair part requirements in different regions, cause trains to lose a little capacity after a few runs unless maintained according to the 'fragility' of the type. Legendary trains are high maintenance, electric trains low, etc.

4) Pay more attention to the animation, no collecting something at the station until the train actually arrives.

5) Make it possible to pay to improve a factory production speed.

6) Make it more obvious 'to whom' gems are being paid to buy items more quickly than can be produced. Call it 'a market', and have the items delivered on 'an express train' instead of magically appearing.

7) Make it possible, at a cost of time and coins, to ship trains and warehouse items among regions. No more 'magic instant transport of items across regions.'

8) Add some history to each train, make it possible to read more about the era and life and times of the people that made each train have a place in history.

9) Make it impossible to 'pay real world money to win' a competition.

10) To make it worth your time, charge a monthly subscription fee.

11) Change the nature of the random number generator so that every player is guaranteed the experience advertised, for example, make it certain sure that every 100 'boxes' of a certain sort deliver the advertised results, the only question being which box has what. That's really, really different than 'the average 1000 players can expect over time' -- just ask a statistics person why 33% of the people will hate you if you don't do that.