portion as it now exists and leave room for the engineer and a supply of wood. In the writer's opinion, the "Oregon Pony" was the counterpart on a slightly smaller scale, of the pair of locomotives already mentioned as built a few months later.
- Diameter of cylinders—6"×l2" stroke.
- Diameter of drivers over tires—34"
- Driving wheel base—7'
- Total wheel base—7'
- Total length of engine and tender over couplers—14'–3½"
- Total weight of engine and tender—9700 pounds
- Tractor power at 10 miles per hour—810 pounds
- Boiler—36" in diameter
- Length of fire box—33"
- Width of fire box—18"
- Height of fire box—43¼"
- Length of boiler over all—67"
- 67×114×25" flues
Turning for contrast with the present day to a recent Union Pacific locomotive, No. 5512, of 2-10-2 type the following is found:
- Diameter of cylinders 29%"x30" stroke
- Diameter of drivers over tires—63"
- Driving wheel base—22' 6"
- Total wheel base, engine and tender—79' 4¼"
- Total length of engine and tender—88' 4¾"
- Total weight of engine and tender in working order—592,500 pounds.
- Tractive force—70,450 pounds
- Boiler—88" in diameter
- Length of fire box—126"
- Width of fire box—96"
- 305 2¼" and 5½"x22' 0" flues
It may be questioned if, should an engine of this size have been placed upon the Oregon Portage Railroad in 1862 the track would have borne the strain for a single revolution of the wheels yet such locomotives are becoming common on the leading railroads of America.
That the owners of the Oregon Portage Railroad were
