Col. John Stevens of Hoboken, N. J., had by 1825 long been intrigued
with the idea of constructing a steam locomotive, having had
considerable success with steam as a method of propulsion on water. In
that year he constructed a small experimental 4-wheeled engine, the
first rail locomotive to be built in this country. The unflanged wheels
were kept on the flat rails by vertical bars that projected down from
each corner of the locomotive. These were fitted on their lower ends
with horizontal rollers bearing on the inside of the rails.
Equipped with a vertical water-tube boiler, and with its horizontal
1-cylinder power plant geared to a rack located between the two rails,
it was built only for demonstration and experimentation. It was often
run, however, on a small circular track laid out on the lower lawn of
Stevens’ estate at Hoboken. This was the first steam railroad in
America.
[Illustration: Figure 1.—Original boiler, now in National Museum, of
experimental locomotive built in 1825 by Col. John Stevens.]
Of this original locomotive only the boiler and safety valve remain.
They are on exhibition at the National Museum (USNM 180029), where they
were deposited in 1888 by the Stevens Institute of Technology. The
boiler (figure 1) contains 20 wrought-iron tubes, each a little over 1
inch in outside diameter, set closely together in a circle and
originally surrounding a circular grate, now missing. It is 4 feet high,
including the headers, and 1 foot across, and was formerly enclosed by a
jacket of thin sheet iron topped by a conical hood on which rested the
smokestack.
Wood used as fuel was dropped onto the grate through a door in the hood,
and water was put into the boiler through a pipe in the bottom header.
Steam was taken from a 1-inch pipe in the top header. The boiler when
new is reported to have sustained with safety a steam pressure of 550
pounds per square inch. The design of the boiler was patented by Stevens
on April 11, 1803.
The safety valve (figure 2) is of simple design. It consists of a lever
10 inches long from which a 4-pound lead ball about 2½ inches in
diameter is suspended. Beneath the lever, and about 1 inch in from the
fulcrum, is a disk valve controlled by the weight of the ball, which
hangs by a stirrup that can be moved to any of several notches, so that
it can be set for different pressures at which the valve will open.
[Illustration: Figure 2.—Original safety valve of Stevens’
locomotive, now in National Museum.]
A small, nonoperable model of the locomotive, about 2 feet long (figure
3), was made in the National Museum in 1898 (USNM 180241) and is
exhibited there. A full sized operable replica, constructed in 1928 at
the Altoona shops of the Pennsylvania Railroad Co., was demonstrated
(figure 4) at the Stevens Institute of Technology on November 23, 1928,
upon the occasion of the inauguration of Harvey N. Davis as president of
the Institute. It was given by the Pennsylvania Railroad to the Museum
of Science and Industry at Chicago in 1932, where it is now exhibited.
Another replica of the Stevens locomotive, made by the Pennsylvania in
1939, appeared in the railroad pageant at the New York World’s Fair in
1939 and 1940, and for a time in 1941 was exhibited at the Pennsylvania
Station in New York City. In June 1941 it was placed on exhibition in
the museum of Stevens Institute, where it remained until March 1943. At
that time it was returned to the Pennsylvania Railroad Co., and has
since been stored in their enginehouse at Trenton, N. J.
[Illustration: Figure 3.—Model of Stevens’ locomotive, in National
Museum. The boiler is shown outside the sheet-metal shell which
normally surrounds it.]
[Illustration: Figure 4.—Full sized operable replica of Stevens’
locomotive, built in 1928 by Pennsylvania Railroad Co., being
demonstrated at Hoboken, N. J., on November 23, 1928.]
The design of these replicas is based in part on the recollections in
the 1880’s of the grandson of John Stevens, Dr. Francis B. Stevens, who
was a frequent passenger on the original locomotive in 1825 at the age
of 11. These recollections are contained in letters from Dr. Stevens to
J. Elfreth Watkins, onetime curator of transportation and engineering of
the National Museum. Stevens’ letters, dated March 30, 1883, January 17,
1888, and November 19, 1892, are now in the archives of the Museum.