I would imagine that the rail execs were afraid that they’d be next in the assaults!
I was in the SF area about a week later and I’ve never seen them so patriotic. Never have been since then.
On the trip back home on Amtrak, there was a terrorism scare in Utah that turned out to be nothing more than an Amtrak engineer blowing by a red block signal. All Amtrak long distance trains were shunted onto the nearest siding until the mess in Utah was straightened out. We spent five hours on a siding on the Union Pacific route in the mountains near Dunsmuir (CA) going nowhere.