Make tram cars that sit on giant plates that straddle giant cuboids of ice, and rail beds that are like luge lanes, pulled along by overhead ropes. Have the wa

Make tram cars that sit on giant plates that straddle giant cuboids of ice, and rail beds that are like luge lanes, pulled along by overhead ropes. Have the water in the lanes flow at the ends into waterwheels that help drive the ropes as a primitive form of energy recovery, all driven by a power-take-off from a giant coal power steam engine on the surface that also serves to power a massive reverse-rankine cycle refrigerator that makes the ice blocks and slides them down into the tunnels - the gravity also helping pull the ropes that drive the trams. Of course, the massive coal plants are going to accelerate global warming, so you're gonna need to build more of these ice-cooled underground transit systems and even water chilled underground housing for people as the surface temperatures rise and rise.... And now you've got this wild 19th century Jules Verne-esque icepunk world in thermal runaway all built up for a hell of a novel-to-be.