1. On June 4, 1942, a train carrying troops derailed in Devon, PA, killing 5 soldiers and injuring several others. The accident occurred due to a misplaced switch on the tracks, which was later determined to be an act of sabotage.

2. In 1989, the Pennsylvania Fish and Boat Commission introduced a new program called "Fish-for-Free Days," which allows anyone to fish in the state's public waterways without a fishing license. The first Fish-for-Free Day coincidentally fell on June 4.

3. On June 4, 1909, the first flight of a Westinghouse airship took place in Pittsburg, PA. The airship, dubbed the W-1, was designed to be used for passenger and mail transport and had a cruising speed of 45 mph.

4. June 4, 2013 was a significant day in Pennsylvania politics, as it marked the primary election for the state's governorship. Tom Corbett, the incumbent at the time, was facing a tough re-election campaign, ultimately losing to Democrat Tom Wolf.

5. Pennsylvania has a rich history in the world of professional sports, and June 4 has seen several noteworthy events in that realm. On June 4, 1940, the Philadelphia Athletics traded away legendary slugger Jimmie Foxx to the Boston Red Sox, and on June 4, 1984, the Pittsburgh Penguins selected future Hall of Fame defenseman Mario Lemieux with the first overall pick in the NHL Draft.