Need help for first playthrougj

[DARKS1DE85]

So I've gotten to the train robbery with John (I've gotten the oil wagons there) I went towards the wagon after i talked to john at camp but talked to Abigail before I went and it started the fishing mission and now that I've completed said mission I cannot do the train heist. Can I load up a previous save to fix this? 

[The Blackangel]

Did you walk up to John under the tree after you went fishing with Jack, or did you just go to where the wagon is? If you just went to the wagon, then you went to the wrong place. Talk to John again, then head out to the wagon. If Sean is there shooting at bottles, then you're on. if not, then you've missed something.

You can try reloading to a previous save, and steer clear of Abigail as far as you can. But I would try talking to John first, if he's there in camp. If not, then something is amiss. You could try sleeping as that sometimes resets a lot of stuff, like camp chores. You never know it may bring John out of hiding.