A common way to win pistol round as T on train is that one guy buys a smoke and a molly, the other 4 buy kevlar. You will slowly approach B, wait for a smoke down the ramp to block vision from CT connector. The 4 guys with kevlar rush down and get kills, the plant is supposed to be on default. The molotov guy stays up in case everything goes bad. If it does go bad, he throws a molotov down on the bomb to buy some time or even get some kills from up. Works 80% of the time. The thing is in MM people dont often buy defuse kits in pistol rounds.
Working on it..