GR translation: snarling inward toward that famous S-curve

[Mike Jing]

P386.9-16   Amateur Fritz von Opels all over the place here, promising a
lively sprint for Slothrop snarling inward toward that famous S-curve where
maniacs in white helmets and dark goggles once witched their wind-faired
machinery around the banked brick in shrieking drifts (admiring eyes of
colonels in dress uniforms, colonels’ ladies in Garbo fedoras, all safe up
in their white towers yet belonging to the day’s adventure, each waiting
for his own surfacing of the same mother-violence underneath . . .).

Who or what is doing the "snarling" here?
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