Laszlo Radford

Laszlo Radford is a wastelander armed with a Railway Rifle. He is hostile and will attack on sight. As a random encounter, he has been spotted at a number of locations in the Capital Wasteland (see Fallout 3 random encounters), sometimes with Sam Warrick. Although Laszlo is a named NPC, there doesn't seem to be any quest or plot line attached to this character. Feel free to blast him on sight.

He also carries 2 leather armors with him.

He spawned twice (two different games) for me when I Fast Travelled to the Meresti Trainyard

Of note, on the west side of the trainyard, by a red wagon, there's a small shack with a lot Railway Spikes, since Laszlo's most notable loot is the famous Railway Rifle I concluded that this is where he lives, even though he has no known relationship with the Family.