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Just looking at a few freight trains the other day and a couple of observations.
Most flat cars are two containers long and most box cars are built for maximum volume and ease of loading and off loading.
The trains I saw had an almost random set up of load and empty cars (ie: Engine , two or three flat cars with loads then a few with no loads then a few box cars and then a few more flat cars with no loads and at the end the guards van) with little if any thought given to aero effects.
Maybe those detachable type flaps fitted to truck prime movers may be an option?
Pete.
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