In 1968, a new tank wagon is introduced with a problematic axle load. This got me thinking and calculating. The tank wagon "BR TTA Air-braked Tanker" (filename: "wagon-tta") doesn't have tracks that are able support that weight until years later and those are the "premium" tracks. The weight of such a tanker filled with, bearing in mind the current density value, crude oil, it would weigh a total of 47t. On two axles. The same story is present in the older ("RCH Tanker wagon", wagon-tanker-rch) being too light in terms of axle weight (26t payload + 11t weight =/= 16t axle load).
So we are off with that axle load, but how do we calibrate realistic values? Searching Google
, I found a site with a listing of relative densities of liquids. The interesting entries are: crude oil (790-973 kg/m³), fuel oil (890 kg/m³) and petrol/gasoline (≈724 kg/m³ for petrol and 832 kg/m³ for Diesel
). The rough goods "Chemicals" are abstracted to simplify the game and 860 kg/m³ is probably a good approximation. Glad to find our current values taking differences into account, I do suggest that fuel oil be adjusted down to 900 kg/m³.
Thoughts on this?