Great thread!! Gordon Gebert was the name of the child actor that played the part of the son. In his adult life, he is an architect and professor. I found a picture that shows him holding the locomotive flanked by two of the passenger cars. Looks like they were standard "Irvington" cars as you can see from the one on the right. Also, if you look closely, it appears that perhaps some sort of "stick-on" label type strip was used over the standard lettering...??
Alan
