Max:
Is any of this info that was in the reference I posted awhile back useful:
“In overall appearance, the cars are excellent replicas of the 1903 Brills used on the Council Crest line at Portland, Oregon. There is one window more per side than the Council Crest cars, but otherwise they follow the design closely. The bodies, including sides and roofs, are built of steel. The interior trim and seats are of wood and present an authentic appearance. There are seats for 40, and a maximum of 40 standing passengers can also be accommodated.”
For more info here’s the link: http://www.heritagetrolley.org/TNERJMemphGalv.htm
You said you tried writing Kasgro. Note that the above reference mentions Kasgro and Gabe Kassab who was the project manager for the Galveston trolley project. I met Gabe about 15 years ago at the Pittsburgh Pirates Fantasy Camp but he would be about 90 years old now if he’ still alive. Try calling Kasgro as their website gives phone numbers and email addresses of several individuals. Perhaps there’s someone there that remembers the project.
Also what is the disposition of the 4 cars? Were they scrapped or do they still exist somewhere? If they're not scrapped, have you tried the various trolley museums? Even trolley museums outside of Texas may have purchased a car as an example of a unique non-wired streetcar.
HTH,
Bill