L-105, the data in the table is based on the two oil-burning Z-6 Challengers 4000 and 4001 owned by the GN during the 1940s.
The table shows horsepower and then tonnage on percent grades all the way up to 2.2%.
Here are the HP and 0.2% grade numbers:
Z-6 4,050 HP and 10,500 tons (4-6-6-4)
N-3 4,200 HP and 11,413 tons (2-8-8-0)
R-1a 4,224 HP and 13,500 tons (2-8-8-2)
R-1b 4,370 HP and 14,470 tons (2-8-8-2)
R-2 5,193 HP and 15,540 tons (2-8-8-2)
The Z-6 had 69-inch drivers and all the others had 63-inch drivers.
All the locomotives in the table were oil-burners.
I hope this is useful info for you!
