Boom badge.

terrorists win.

how to find and get: make sure to be on the train map. the first c4 is hidden inside a single box near the noob npc. grab the box and shake it until the box lid opens. click the c4 and the first one found. the second can be found hidden behind the three boxes at the back of the train. throw away the boxes and click on the second c4. the last third one can be found at the top of the back side of the train. go walk out of the door and jump up the roof. click the last c4 and you will have the badge.