As you think or capability to modernizing is addition "DB Set XL"
in order to compatible with plug-in: "UKRS Industries"
I means convert freight car to a new type Load
For Example:
"Refit default rvs to new cargos"
https://www.tt-forums.net/viewtopic.php? ... ilit=refit
My links:

https://grfcrawler.tt-forums.net/details ... ils&id=165

https://grfcrawler.tt-forums.net/details ... ils&id=166
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The same question i written for Michael Blunck To wednesday 26 march 2008 making no reply
The page for Michael Blunck is Not available. I am new user and i have consciousness that described
over problem it can be in unsuitable section.