What we need is a simple interface for setting up our own custom regions not unlike the one used for TurfFX grass, except not as complex.
A set of pulldown boxes, scroll boxes, and radio buttons that allow us to choose such things as region, era, passenger set, the number and era for carz, grid texture, and anything else that might be needed to start off with. The advantage is that we can then customize these settings any time easily rather than editing config.txt files to implement our preferences. The other advantage is this will allow those who aren't among the Trainz experts and uber geeks who find editing files and customizing parameters an easy thing to do.
In the end, this interface will accomplish the same thing except there's no config file editing.