rotating grate

Following the seemingly easy instructions from the ticket agent earlier in the day, I began to swipe our two MetroCards in order to get the five of us through one of the full-size rotating grates.

From this conveyor, the coal would fall into the loaders and from there was directed through downspouts to the rotating grate conveyor inside the boiler, where it burned slowly, producing a temperature inside the boiler of approximately 1200 C.