David & Tim,
Earliest ORER LV page I have is April 1921, which shows Series 25000-26999
with 1989 "Coal, steel, hopper bottom" cars. Designation GA, Listed capacity
1788 cu ft. [this varies between ORER] & 100,000 lbs. This class was not
listed on my 1920 page, where the LV data has a September 1920 date.