Lakers' Jeanie Buss -- We're Incredibly Proud of Train Heroes

More Lakers props for the Lakers fan who helped subdue a terrorist on a train in France -- with the president of the team telling TMZ Sports she couldn't be more proud of the guy.

We spoke with Lakers president and co-owner Jeanie Buss who tells us ... "We could not be more proud of Anthony Sadler and his friends for stepping up and thwarting what could have been a tragedy."

She adds, "This has touched our hearts ... they showed a lot of courage."