Gina Osborn was Metro's first ever chief of public safety ... up until the end of March, when she was relieved of her position.

We're telling you about Osborn's firing because it is part of the bigger story of LA Metro's continued struggle with ensuring the safety of its riders on trains and buses ... there were three more stabbings at Metro stations or buses just this week alone.

KNX chief correspondent Charles Feldman called up Gina Osborn ... and her lawyer Marc Greenberg as well ... and asked her about Metro's failures to enforce public safety.

KNX News reached out to Metro with a request to talk with their CEO Stephanie Wiggins to give her an opportunity to respond to Gina Osborn's criticisms; here's the statement provided by Metro in lieu of an interview:

"Metro does not comment on personnel matters.  

That said, public safety is Metro's top priority. Most security incidents arise from untreated mental illness and drug addiction.  Although Metro didn't create these issues, we must manage them. We're increasing law enforcement presence, enhancing cameras, lighting, and barriers, and exploring fare gate designs. We're also employing a care-based approach with ambassadors, homeless outreach, and crisis intervention teams."