This game, like the NimbleBit game Tiny Towers, is super easy to pick up and easy to get started. But although the game is free to play, they really push you to make in-game purchases by incorporating several in-game mechanics that really slow progression: - Trains break down, and youre forced to either pay with coins or train parts to get them running again. This happens WAY more often than it should. - Cost to add more trains increases a lot, fast. First it starts at about $4K, then goes to $8K, $11K, and $14K. - After purchasing the train, you have to purchase the line, then you have to pay again for the train that uses that line. And if you change the train using that line, you pay AGAIN. Too much nickel-and-diming.