From what I remember of the machine, it was pretty neat.
It drove down the street, loading snow in front, then melting it internally, squirting anti-freeze into the melt water, then dumping the water out the back to run down into the sewer.
I remember seeing pictures of it working on the news.
I thought it heated the snow though.
Either way, it sure was effective.
https://en.wikipedia.org/wiki/Metromelt
"The snow machine melts approximately 136 tonnes (134 long tons; 150 short tons) of snow per hour using air/fuel combustion to heat water and mix it with snow in a melting tank. The melted snow continuously drains from the tank, as it overflows, out of the melter and into storm drains or sewers along the road. The machine is self-propelled and self-loading, and resembles a large truck-mounted furnace with a snow-gathering conveyor belt at the front end."