portion as it now exists and leave room for the engineer and a supply of wood. In the writer's opinion, the "Ore- gon 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"xl2" stroke. Diameter of drivers over tires—34" Driving wheel base—7' Total wheel base—7' Total length of engine and tender over couplers—14'- 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—43% " Length of boiler over all—67" 67x114x25" flues
Turning for contrast with the present day to a recent Union Pacific locomotive, No. 5512, of 2-10-2 type the fol- lowing 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' 4*4" Total length of engine and tender—88' 4%" 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 2%" and 5i/2"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 becom- ing common on the leading railroads of America.
That the owners of the Oregon Portage Railroad were
