Great but...

great game, and I would immediately put it 5 stars if not for one thing. I want to developers to reasonably explain me one strange, incomprehensible progression in price for new locomotives. Why is the first steam locomotive, conditional price 5000, second 8000, third is absolutely identical to the first 11,000 !!! What is logic of such pricing?!!

Сига about Pocket Trains: Railroad Tycoon, v1.0.10