Polar vortex: Fire used to melt ice on Chicago train tracks January 30, 2019 at 01:47PMhttps://https://bbc.in/2MI4Akl Flames from gas-fed heaters stop snow and ice from clogging up the track at railway intersections.

Flames from gas-fed heaters stop snow and ice from clogging up the track at railway intersections.

from BBC News - World https://bbc.in/2RsdKSK