The ubiquitous coffee stirrer strikes again to provide this simple central heating radiator to go into the station building.  (Quite what a radiator is doing there, with no concept of a boiler, is pure artistic licence!).  A few coffee stirrer sticks separated by Hama beads (or something similar) and held together top and bottom by a section of cotton-bud-stick, plus, at the bottom by a short length of mains copper wire, which obliges with providing the plumbing too.