BART spokesman Jim Allison said a man was reported under a train at the Ashby station at 4:40 p.m.
The station was closed while emergency crews worked to remove the man, however was reopened at 5:35 p.m.
Allison said the man was reported alive and taken to a hospital with unknown injuries.
An investigation by BART police is currently underway.
No further information has been released at this time.