"In mid-December 2021, Adrian Guerrero, Union Pacific’s general director for California and Pacific Northwest operations, wrote to Gascón asking him to reconsider his December 2020 Special Directive 20-07, directing county attorneys to decline to prosecute or dismiss before arraignment charges including trespassing; loitering; being in possession or under the influence of drugs, drug paraphernalia, or alcohol; and making criminal threats or resisting arrest."[1]

So, what I would deduce from some googling is that LA prosecutors are essentially declining to prosecute the homeless camping on railroad tracks and UP at least thinks this gives criminals an opportunity to act.

While the idea of "not criminalizing homelessness" is appealing, what is really needed is solving the problem because a permanent gray area of homeless illegally camping somewhere sooner or later will provoke a reaction.

[1] https://www.city-journal.org/union-pacific-facing-rising-rai...