Found one
http://www.youtube.com/watch?v=XqHvja7fU00
Looking at it, the boxes are 40 standard and high cube and 45 foot high cube boxes, the weights for these are 3700 to 4500 kgs, most of them are 40 high cubes which generally weigh 3900 kgs.
I'm curious, where did you get the 269 ton figure for the locos?