GR translation: trains full of their own hanging off the cars that lumber overhead

[Mike Jing]

V549.36-550.3   . . . caravans of Gypsies, axles or linchpins failing,
horses dying, families leaving the vehicles beside the roads for others to
come live in a night, a day, over the white hot Autobahns, trains full of
their own hanging off the cars that lumber overhead, squeezing aside for
army convoys when they come through, . . .

So the Gypsy caravans are on the Autobahn, there are train tracks running
above the Autobahn, and the caravans have to squeeze aside when army
convoys come through.  Is this the correct picture here, or did I
misunderstand completely?
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