It happened before 1 a.m. on March 16.
A METRORail spokeswoman said the suspect was harassing a young woman on a train headed south from McGowen station at first, but then turned his attention to the 62-year-old man who boarded the train.
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The man first verbally, then physically assaulted the victim, authorities said.
ABC13 spoke with one passenger, Jon Oxley, who believed he witnessed the tail end of that incident.
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"The guy doing the assaulting is one of these that does the assault and runs for the door," said Oxley.
According to METRO, a social media tip led to the arrest.
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