The initial US owner of that Mexican equipment was Early West Railways, Inc. for the still-born operation at Puddingstone Park near the Los Angeles County Fairgrounds in Pomona. The best source for initial information is the old small format Pacific News -- see issue #44 of April 1965 for information on the project. After that other issues reported use of some of the cars at the San Bernardino Orange Show.
Early West was headed by Redfield "Tad" Finlay (also of Finlay Fun-time Tours) and Pat MOore.
The following equipment is reported to have been obtained by Early West Railways.
Engines from the Coahuila y Zacatecas:
1 2-8-0 BLW 8/97 #15435
6 4-6-0 BLW 5/04 #24252
12 2-8-0 BLW 1/11 #35990
Cars from the CyZ
611, 626, 639, 547 - gondolas equipted with bench seats & steps
604, 668, 681, 729 - gondolas with bench seats and end doors (no steps)
213, 227, 229 - box cars
151, 152 - side-door caboose
cars from the FC Unidos de Yucatan
(1) coach with flat roof w/open platforms
(1) RPO car w/open platforms
(1) open end observation
(2) coaches w/open platforms
(1) RPO car without plaforms (blind ends)
At one time, some of the cars were later stored at the Chino, California, private air port.
Hope this helps.
Brian Norden