jhz563 posted:844 is currently having firebox sections replaced. New material is slightly thicker than original due to better material availability and to allow for a small amount of wastage while in service.
And according to Ed it needs new rods & driver axles, tender baffles rebuilt, new shop to work in, new shiny fasteners, more chrome, Led lighting, digital gauges, Waffen SS style uniforms (those guys got the cool lightning bolts on their collars), self cooling seats, big muffler etc.