Pennsylvania Class HH1s
A unique engine on the Pennsy, a simple-expansion articulated built at a time
when all other articulateds were Mallet compounds. In a departure from
Pennsylvania practice, this engine used a wagon-top boiler. Note the low boiler
pressure. She operated in pusher service until 1928.
Data from Wiener (1930).
| Class HH1s Specifications |
| Wheel Arrangement |
2-8-8-2 |
| Gauge |
Std |
| Road Numbers |
3396 |
| Builder |
Alco |
| Year Built |
1911 |
| Cylinders |
(4) 27" x 28" |
| Boiler Pressure |
160 |
| Driver Diameter |
56 |
| Tractive Effort |
99144 |
| Grate Area |
96.5 |
| Weight on Drivers |
435500 |
| Locomotive Weight |
483000 |