Train mass 280 ton (recorded from the underframe weights on the day)
A2 mass 121 ton
R mass 187 ton
A2 dbhp 1240 (from Dynamometer Car charts)
R dbhp 1605 (from Dyno Car ref “Hudson Power” p.86)
Power/weight A2 = 1240/(280 + 121) = 3.1
Power/weight R = 1605/(280 + 187) = 3.4
Of course, all steam locos can produce much less or a bit more than their rated power, but actual test results from the dynamometer car are the most accurate measure.
Broadford has an elevation of 221 m, Heathcote Jnc 349 m, a rise of 128 m over 22 km, an average grade of 1 in 172.