Wrigley Field's Center-Field Scoreboard Through the Years-- Part 3: Lights, Abbreviations and Grid Lines

LIGHTS--  Lights were added to the scoreboard in teh 1980s, anticipating Wrigley Field's first night game on August 9, 1988.

ABBREVIATIONS--  The abbreviations on the scoreboard--  "SP" (starting pitcher) and "RP" (relief pitcher) -- once designated to columns of numbers identifying the battery of the pitcher and catcher.

GRID LINES--  The white grid of lines (going up and down) separating the inning-by-inning score of each major league game on the scoreboard is not original.  It was added in 1987, along with red horizontal lines that draw attention to the Cubs game.

--CooterBG (Blog Guy)