It was the most runs scored by a baseball team in 110 years when the Texas Rangers clobbered the Baltimore Orioles 30 to 3. A Baltimore Sunarticle lists a few other large baseball victories.
There's no exaggerating how long it has been since baseball has seen this kind of offensive display. The 30 runs scored are the fourth most in major league history. The Chicago Colts (now the Cubs) defeated the Louisville Royals, 36-7, in 1897. No American League team has surpassed the Rangers' output, with the Boston Red Sox and Chicago White Sox totaling 29 in 1950 and 1955, respectively.
A Boston.com article details how the Rangers scored 30 runs. ESPN has the box score for the game here. 16 of the runs scored by Texas came in the last two innings. This game won't help the ERAs of the four Orioles pitchers who each gave up six or more runs in the game. It must have been a painfull game for Orioles fans to watch.