Quoted train rarity/probability percentages are not true. Saved keys & spent them & got 15 grey trains in a row! At least 3-4 should have been blue, purple or gold! Comp prizes also misleading - Gold train shown, got purple! Upgrading trains very slow & extremely difficult to get needed items. Should be able to save up & get the train/parts you want instead of 'randomly' getting the same grey train & nuts each time. Told to contact support but already written to them several times about this.