Polar vortex: Fire used to melt ice on Chicago train tracks
Flames from gas-fed heaters stop snow and ice from clogging up the track at railway intersections.
from BBC News - Home https://bbc.in/2RsdKSK
from BBC News - Home https://bbc.in/2RsdKSK
Polar vortex: Fire used to melt ice on Chicago train tracks
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January 31, 2019
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