Kato definately has a bias towards certain roads. Throw in a few ounces of mystery choices (Algoma Central was on the top of everyones list as a must have no doubt!).
Actually, I am not even sure there is a bias. But one could write a thesis pondering the motivation for ommitting certain roads form appearing on Kato releases.
For instance, there were B&O lettered RDCs running up into the late 1980s (on MARC by then). B&O owned a large fleet. Did Kato do any in B&O?
There are countless other mysteries.
I like my Kato stuff, but they are also an enigma to me.