By Steve Patterson

VALLEY FORGE, Pa (CBS) — If there is such a thing as a beautiful day to wear all black, this weekend came close.

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But it didn’t make the mourning any easier.

Nearly 500-people gathered at Valley Forge Park in remembrance of two friends on Sunday, 44-year-old GlaxoSmithKline scientist Zuojun (Joe) Lin and 50-year-old Nature’s Soy CEO Fenjin (Gene) He (see previous story).

“No family should suffer from this kind of pain,” said family friend Deana Wang. “Everybody who knew them would say how bright they were, So much happiness that they brought to the people around them.”

Both were successful, loved, and influential in the Chinese community, bridging culture and art from Beijing to Chester County.

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Both men were tragically killed here last weekend, less than a mile away from the service.

Police say a westbound train struck the two men as they were walking on the tracks near a sharp curve.

The family says they were struck during a morning exercise. They are calling for warning signs near the point of impact.

“It’s wide open, without any warning, any sign or any fence,” Wang said. “The train can come to the spot where the impact occurred in two seconds.”

A memorial with pictures and flowers has been set up at the spot where the accident occurred.

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Police are investigating why the accident happened, and why the men were on the tracks when the train was coming through.