Curtis Lemay
Posts: 12969
Joined: 9/17/2004 From: Houston, TX Status: offline
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quote:
ORIGINAL: UP844 The article is perfectly correct, but it has a not-so-small flaw: it refers to US railroads. For the 1940s, it assume a 180,000 lbs gross capacity per boxcar: this implies an axle load equal to 45,000 lbs/axle. Current (2020) allowed axle loads in Europe range from 22.5 to 25 metric tons (49,600 to 55,100 lbs) per axle; in the 1940s 15 metric tons per axle would be a realistic assumption, especially outside Germany, France and Britain. Moreovere, 2-axle railcars were the norm in that age. So, the average railcar would have been able to carry approximately 20 metric tons (44,000 lbs) You provide no link for this, but I'll take your word for it (I doubt I would get the same courtesy). But, such would have to be much smaller (shorter) cars. quote:
Forget 60-car trains: this is a short train in US practice, but European railways do not have the very long sidings of US railways. The theoretical current standard for freight trains is 750 meters (~2,500 feet) and was about half this size in the 1940s. On the other hand, few locomotives would have been able to haul a 60-car trains, especially on steep and winding mountain lines (even though the Spanish Railways had some of the most powerful steam locomotives in Europe). Locomotives can be linked together. However, if the sidings are as short as claimed, that wouldn't do any good. But, now we have much shorter trains than in my example. It really is the length of the train that forms the traffic issue. quote:
480,000 tons per month @ 660 tons per train means 24 trains per day, not 3.5 (and another 24 trains coming back), i.e. 48 trains per day. I seriously doubt a single line mountain railroad could absorb such traffic. I don't see why. An hour between trains? Plenty of time to get such short trains onto a siding on the return. And, note that I was being VERY generous on the supply calculation. In all probability, that 60,000 tons included everything in the Desert, not just two panzer and two motor divisions. And the invasion force wouldn't have been 16 panzer and 16 motor divisions anyway. The real supply requirement for an army group would be far less than 480,000 tons per month - I just don't have any better figure. Also, let's not forget that trucks extend supply about 500km past the railhead. That gets you beyond Madrid - without even a railhead in Spain.
< Message edited by Curtis Lemay -- 9/7/2020 3:26:17 PM >
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