C.R.A.S.H.

Tenpenny sends CJ to tail a journalist on a moving train without being spotted. CJ has to keep his distance, then make the move when the journalist meets a contact.
Snail Trail is a mission in Grand Theft Auto: San Andreas given to protagonist Carl Johnson by C.R.A.S.H. officers Frank Tenpenny and Eddie Pulaski from the gas station/garage in Doherty, San Fierro, San Andreas.
Carl enters the garage and is greeted by Jethro. He says that some cops are looking for him in the office. Carl realizes that it is Frank Tenpenny and Eddie Pulaski. He is welcomed by them, and they ask him how things are going, and how his brother is doing. Later on, they order Carl to kill a young journalist, who is apparently investigating Pulaski. Pulaski also tells Carl to kill another journalist who is supposedly going to meet the young journalist at the end of Yacht Harbor in Santa Maria Beach, Los Santos.
Carl heads for and obtains a sniper rifle hidden by Tenpenny at the construction site behind the garage. After doing so, he heads to Cranberry Station, just across the street from the garage, where the reporter is waiting for a train to board. The reporter boards the train and Carl pursues it. The train stops at Market Station in Market, and the reporter alights. He then hails and boards a taxi and heads for the end of Yacht Harbor in Santa Maria Beach. Carl discreetly follows him. There are three possible routes the taxi driver can take to reach the harbor. Once the reporter arrives at his destination, he meets the journalist, and starts talking to him. However, before they can finish their talk, Carl kills the two.