Made available during the first play-list update of Call of Duty: Modern Warefare 2, Team Deathmatch Express is exactly the same as the original; the only difference of the two is the extreme time reduction made during the wait between rounds, hence the word "Express".
Hey dude, wanna play a few rounds of Team Deathmatch on Live?
Yeah, sure. But let's do express. Heard Team Deathmatch Express is a lot quicker. Less wait time in the lobby.