[CBQ] Height above railhead for a railroad car floor

["smokyjoe66" <js08ws62@sbcglobal.net>]

As usual, I'm supposing that the answer to my question is so basic and simple 
that most of you will consider it childish and simple. Nevertheless, here it is:

A prototype railroad freight train pulling a string of different types of cars 
from various railroads is basically a locomotive pulling a segmented, 
articulated platform on which is placed loads of many different sizes, shapes 
and weights. It doesn't seem to matter in which order the cars are placed for 
the purposes of the dynamics of moving the manifest freight train over the 
railroad from point A to point B. Hence, it may well be that the first car 
behind the locomotive is a relatively light, unloaded flatcar.

Question: what are the specifications for the height of this platform above the 
railhead? Also include tolerances of the specifications, if known please.

Minds like mine think of these things, and often tmes, little else. 




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