I guarantee you arming random train yard workers or whatever you are envisioning is going to just lead to them being killed before they hear a peep and their guns being stolen, serials stripped, and sold. The bad guys will have the drop and the good guys aren't going to shoot first. The only good guys with guns that are able to stop bad guys with guns are SWAT who come in and can create a controlled environment to conduct a controlled response. Arming security guards and your average grunt cop just does more harm than good. Taking a gun out into the field should be a thoroughly planned affair like how SWAT operates.
