Ok, just went in to remind myself, so I see what you all mean. If his region file doesn't show there (I've made a couple) I'd say the region isn't set up correctly. CM may well not shows errors, but the file must be faulty somehow. I'd suggest make sure the two lists of cars is identical, ie, the list in the config itself, and the kuid list below. Ensure the first car is zero, (not 1), ie something like below (part list)
username "Australia Region 1940s"
kind "region"
trainz-build 3.5
description "Region asset specifying road vehicles used in Australia in the 1930s-1940s plus location details ie latitude and longtitude for Lithgow, N.S.W.."
category-class "YX"
category-region "AU"
category-era "1920s"
watercolor 154,104,53
defaultjunction <kuid:61119:24120>
ontheright 0
longitude 150,1,5
latitude 33,48,-1
altitude 0
car0 <kuid:124060:29021>
car1 <kuid2:381430:100165:1>
car2 <kuid2:381430:100187:1>etc..
One character out of place will throw it. The kuid table would be identical ie...
kuid-table
{
car0 <kuid:124060:29021>
car1 <kuid2:381430:100165:1>
car2 <kuid2:381430:100187:1>etc..
Other than that, I haven't a clue.