These are the quests associated with the railway update released on 9/8/2015
The first quest is “Bridge Across the River” however… many people completed the quest beforehand by a glitch in the game… so you may or may not have already received this first quest!
Since you cannot store Hay in the Barn, you need to make hay to pass the first part of this quest!
After completing Bridge across the River, you will receive 2 more quest lines… Dairy Cows and Railway Station. Dairy Cows is the only quest in that line… nothing else will pop up after finishing that quest.
After Completing Railway station, you will receive each quest as pictured.
Great Income (last quest for Railway Update)