Trevor is going to rob a train, maybe this time it will actually be worth the risk.
Head to Trevor's trailer as either Michael or Trevor,and watch the cut scene.
You will be automatically switched to Trevor. Hop on the bike and head to the train tracks.
Drive up the dirt road along side the tracks.
Now jump on the train with your dirt bike.
This part can be difficult. After you cross the bridge steer right onto the hills, there will be a ramps near the end. Use them to jump on the roof of the train cars.
Drive along the top of the train until you reach the engine.
Once inside, choose to accelerate the train using your 'Right Trigger' button.
You will be automatically switched to Michael. Head under the bridge continue to the one after it and watch the cut scene.
Now drive the boat to the orange container, throw a Sticky Bomb onto the doors and blow them open.
You will be automatically switched to Trevor. Merryweather will show up in full force, start taking them out.
Use Trevor's special ability on the two choppers.
Take out the snipers on the bridge. Get out a Sniper Rifle, turn on the infrared, hit the three guys on the bridge and two high on the grass.
A third helicopter will spawn dropping two parachuters, take them out with your Sniper Rifle.
Once clear, Michael will come get Trevor with the boat, jump in.
You can choose to drive as Michael or shoot as Trevor. Trevor being the recommended choice as the rapids are difficult to manage.
Once clear, head to the way point.
Now go to the getaway vehicles and the mission ends.
To get gold:
- Time - Complete the mission in 11 minutes and 30 Seconds. Be fast with the dirt bike and quick and accurate when taking out the Merryweather boys.
- Fastest Speed - Reach top speed on the dirt bike.
- Better than CJ - Land on the train using the first jump. Once you know the area, you should be able to make it on the first attempt.