A 48, or forty-eight is a type of freight train car that usually holds the same containers you would see an 18 wheeler pulling?minus the wheels of course. The forty eight looks like a gondola and sometimes has the numbers 48 painted on the side of the car. Besides railroad workers?train hoppers and graffiti artists are probably the only people that would know or care what a "48" was.
"That freight was carrying nothing but 48s with containers stacked double high."
buckled is when someone either looks like, or has actually been punched in the face with a great-big "tombstone" belt buckle--the kind that are typically worn by those on the Professional Bull Riding circuit.