How to pass the mission "wrong side of tracks" easily.
1.As you reach the railway station of Los Santos and start the mission, enter the Jetpack code I.e. "yecgaa" and follow the train.
2.Don't step on the train before it enters the tunnel, otherwise you will be thrown back from the top of the train.
3.Just follow the train by flying on top of it using the Jetpack.
4.Just as the train crosses the last Overway and is about to enter the tunnel, step on the train, leave the Jetpack,use the Shortgun to kill all the Vagos on the top,as quickly as possible.
5.Finish your job quickly before the train enters the second tunnel,which will let the Vagos pass by, and throw you down the train.
6.Now go to BigSmoke at the station and drop him home.
7.And you pass the mission.