Fast Break derailment

The Fast Break derailment was a rollercoaster derailment that happened at Fastbreakpark in Lexington, Kentucky on July 12th, 2009. It occurred when a train on the park's signature Fast Break roller coaster derailed during it's initial launch section.

Incident
The accident occurred on July 12th, 2009, just shortly after 1:20pm. The coaster deployed one of it's trains, which was full of riders, out of the station and into the pre-launch section without any visible signs of trouble. The train itself was a 7-car, 4-seater train with 28 riders overall onboard. At 1:22pm, the coaster's launch was activated, and the coaster train was propelled up to 130 mph. However, less than 4 seconds later, the wheels on the train suddenly sheared off and the first two cars snapped off from the rest of the train as a result, flying off the track and into an empty employee-restricted section.

6 riders were pronounced dead on the scene, and another rider was pronounced dead at CHI Saint Joseph Health Hospital at 2:15pm. All 21 other riders experienced critical injuries, such as broken and dislocated bones, and one case of internal bleeding.

Aftermath
Fast Break was promptly closed off from the rest of the park for the rest of the 2009 season, while an investigation was led out on the ride. It was later determined that the main cause of the derailment was extremely high stress on the train's wheels due to the ride's high speeds.

In 2010, new Intamin trains with vest restraints and safety collars were added to the ride, replacing the old trains. Trim brakes were also added frequently throughout the ride, including one right after the initial launch section, causing the coaster's top speed overall to go down to 118 mph.