By Matt Petrillo

DELAWARE COUNTY, Pa. (CBS) –The NTSB is investigating a crash in Delaware County Thursday where a freight train and SEPTA trolley collided, injuring six people. A team of NTSB investigators arrived in Darby and are working to figure out what lead up to the crash.

Neighbors want answers too.

READ MORE: Police: Man Shot Multiple Times, Killed Inside West Oak Lane Corner Store

The collision of a CSX freight train and a SEPTA trolley rocked this Darby neighborhood around 8:30 Thursday morning.

“It was a very big bang. It woke them up for school before the alarm went off and they were wondering what was going on,” Darby resident Sharonda Pinkney said.

From above in Copper 3, you can see the front windshield of the trolley shattered from the crash. We also spotted the arm from the rail crossing on top of the trolley.

“I ran into the store and told them to call 911, everybody call 911,” Gary King said.

King saw the collision from the corner.

“The trolley was coming up, the train didn’t stop. The trolley tried to stop but that train didn’t stop. And it just went right through the light. I heard a loud crash like a loud blast,” he said.

READ MORE: Philadelphia Veteran Marching To Gov. Wolf's Home To Urge Action On Gun Violence

SEPTA says the crash left five passengers onboard the trolley, plus the driver, hurt — all with non-life-threatening injuries.

Eyewitness News also learned 6th and Main Streets in Darby, where this happened, is the only intersection in the nation where an active freight rail line crosses a fixed active rail transit line, according to U.S. Congressmember Mary Gay Scanlon.

“It is a notoriously bad intersection,” she said.

Scanlon represents Delaware County. Photos show her visiting this very intersection from August.

“It was kind of appalling to be out there. I mean there’s all these streets that come together, clearly, it’s missing some traffic safety controls,” Scanlon said.

She adds, because of President Joe Biden’s $1 trillion infrastructure plan signed into law last month, SEPTA is expected to receive extra federal funding to make improvements to intersections like this one.

MORE NEWS: Penn To Initiate Process To Review Complaints After Professor Amy Wax's Anti-Asian Comments

Meantime, Main Street in Darby has now reopened after it was closed for seven hours.