C&O operated 335 nearly identical medium-weight 2-8-0's in three classes:
G-6 (75 engines, #351-425, renumbered in 1924 to #715-784, built 1899-1901),
G-7 (211 engines, #426-630, renumbered in 1924 to #790-995, built 1903-1907, and #631-636, renumbered in 1924 to #996-1001, built 1916), and
G-9 (50 engines, #633-682, with #633-638 renumbered to #683-688, then the whole class renumbered in 1924 to #1010-1059, built 1909).
G-7 engines received superheaters starting around 1916 through 1923. The 35 superheated engines were grouped together in the 1924 renumbering, #960-994. All G-9's were superheated.
I fixed the dark cab number problem by making the cab numbers in white. There is a more accurate gold lettering file included if you wish to use it and think you can solve the problem, but odds are you won't see the cab number without a better fix.
A medium Baldwin standard gauge 2-8-0, based on Chattahoochee Valley #21, currently under restoration at the Southeastern Railway Museum in Duluth, GA. Locomotives of this type were used by shortlines and a few class one railroads all over the USA. It can be relettered by following instructions in the readme and the website you downloaded it from.
C&O G-7s statistics:
Built: Richmond (180 engines), Baldwin (25 engines), 1903-1907, Pittsburgh (6 engines), 1916
TE: 41,140 lbs
Weight: 184,400 lbs
Cylinders: 22x28 inch, rebuilds in 1916 and after got 23.5x28 inch
Drivers: 56 inch diameter
Boiler Pressure: 200 PSI