As in, an 0-4-0ST weighs 96000lbs, is that empty weight, or is that with max coal & water (which wouldn't add to a whole lot)

…Weighing a steam locomotive was quite a secretive affair. Only the regular staff connected with the scale house and specifically authorized observers were permitted inside during the "weighing-in" ceremonies. Like many ladies, the steam locomotive appeared sensitive about its weight being publicly known -- probably another reason why we referred to it as "she!"

This "cloak and dagger" routine was necessitated by the fact that railroads paid their engine crews according to engine weight, besides mileage and time. For example, on the Pennsylvania Railroad an engineer and fireman received more for operating a K4, than an E6 or K2, when hauling a passenger train. Railroad management was, therefore, averse to publicity regarding engine weight. Publicized weight given by Baldwin was based on an engine in working order which left some leeway as to what that might constitute on certain roads; for instance, some based that on one or two gauges of water in the boiler and other roads might figure otherwise. By Baldwin standards the tender weight was figured at two-thirds full.