I can tell you. In the shop the rail ultra costs 11 700 tankoins. This also brings me to another point. I have another account, charge130, and on that account, I have 50k crystals, but no tankoins. I am wanting the rail ultra, but cannot buy it without spending real money. I was wondering if the developpers could add a crystal to tankoin trade. There is already a tankoin to crystal trade that, to my knowledge, has been up and running since tankoins were introduced. This is stupid. Nobody has 100 USD to throw around like a bottle of milk.