It's kind of a "cut-n-paste" job with a paint edit program, and a copy/rename of the files and values to match the new doublestack car. I've done it...
Right at home on the Monon....
L&N SD40 1231 by sunnhead60
L&N SD40 1239 by sunnhead60
L&N SD40 1225 by sunnhead60
Here's a fun game: which L&N...