SAN FRANCISCO -- San Francisco police have arrested a man suspected of stabbing a woman on a San Francisco Municipal Railway train Monday.

Police detained Bobby Brown, 30, a transient, at about 8 a.m. Tuesday at 31st Avenue and Judah Street in the Sunset District, police spokesman Sgt. Wilfred Williams said.

Brown is suspected in the stabbing of 24-year-old Rachel Haynes-Brown on Monday morning on a J-Church train near Church and Market streets.

In a combined statement from Mayor Gavin Newsom's office, the Police Department and Muni Tuesday afternoon, Newsom praised police "for their quick work in apprehending" Brown.

"This excellent police work demonstrates our renewed commitment to the safety of Muni riders and all San Francisco residents and visitors," police Chief George Gascon said. He added that video surveillance from the Muni train was "tremendously beneficial to our investigation."

Muni Executive Director Nathaniel Ford said his agency would continue to work closely with police "to make sure the Muni system is safe and secure for our customers."

Police said Monday that the suspect had no interaction with Haynes-Brown before the stabbing and no words were exchanged. He then left the train at the next stop.

San Francisco General Hospital spokeswoman Rachael Kagan said that Haynes-Brown, of San Francisco, suffered two stab wounds, one superficial, the other more serious, to her left side, but did not require surgery.

She is now in good condition and is expected to leave the hospital Tuesday, Kagan said.

Despite her improved physical condition, Haynes-Brown was still wrestling with the emotional shock of the attack when she spoke with KTVU Tuesday morning.

“A person never thinks they are going to get stabbed you know by someone random on a train,” she said. “So it’s just kind of overwhelming shocking and a little scary to know that (there is a person) out there that does that.”

Police said the suspect in Monday's stabbing resembled the "scruffy-looking" man with a strong body odor who stabbed an 11-year-old boy, Hatim Mansori, on a Muni bus in the Mission District on Sept. 1.

An investigation is ongoing into whether Brown is a suspect in that stabbing, Williams said.