The Great Train Robbery (Achievements) | Campaign - Rebellion missions SC II: WoL Guide
Last update: 11 May 2016
The Great Train Robbery:
Destroy 8 Dominion Trains, don't Miss 3 Trains, locate 6 Diamondbacks, collect 3 Defiler Bone Samples.
Bully the Bullies:
The group of Marauders which will start patrolling the tracks are quite tough, though Marines, on which you should focus your strike force, do very well against them. You'll need to train quite a bit (around 20) of them though, accompanied by medics. That's why you should start producing them from the start of the mission. If you want to minimise the losses, firstly attack the Marauders with Marines and after a while move in with Diamondbacks, Goliaths and other heavy troops. They will deal with them in no time.
The achievement doesn't require you to complete the mission, which means you can also use another, quite dirty trick - loading the game. Don't hesitate to attack the Marauders with the team designated to stop the train, as long as it's numerous. If the Diamondbacks and other vehicles take too much damage, load the game after completing the achievement.
Silver Streak:
If you have some experience from the normal level, gaining this achievement shouldn't be too hard. How you start and do at the end is most important. I'd suggest taking over 5 out of the 6 Diamondback, as you probably won't make it to the last one before the train arrives. The locations of the abandoned tanks are marked on the map added to the mission description. Only the two in the south have slight protection.
Afterwards act just like normally during the mission. Build up your army and move once he train appears on the horizon. Remember that Dominion will at some point start buildings bunkers round the tracks and will send a lot stronger and faster Marauder (compared to normal) squad.
I suppose you shouldn't have problems with the sixth and seventh train (they will only be faster this time), but the last one can cause some problems, as it will have a strong protection, which includes a Goliath a five tanks, amongst others. Look out for them.