WP&YR 69 was built superheated.
The slide valves with superheating is the reason the BP was only 160lbs.
I thought it would be interesting to see how powerful it would have been with higher boiler pressures like other late NG locomotives.
Here is 69's tractive effort at 3 higher pressures, using Baldwin's formula.
((180 x .85) x (21 x 21) x 22 / 42 = 35343 lbs
((190 x .85) x (21 x 21) x 22) /42 = 37306.5 lbs
((200 x .85) x (21 x 21) X 22) /42 = 39270 lbs
Bruce
Edited 3 time(s). Last edit at 01/03/2020 09:52PM by bcp.