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In taking over the interests of the Interlocking Switch
and Signal Company, it had acquired the patents of H.
Tilden and F. S. Guerber for Hydraulic Interlocking, the
first installation of which was made at East St. Louis in
1882. This system gave Mr. Westinghouse the idea of
using compressed air for switch and signal operation, the
result being the Hydro-Pneumatic System wherein control
was furnished by liquid under pressure, the operating
power being compressed air. Later developments brought
forth the Electro-Pneumatic System, which is in use today
and in which the control is by electricity, the operating
power compressed air.
Broadening its activities in 1884, the Company began
the manufacture of electric lamps and electric lighting
apparatus under the Stanley and Westinghouse patents.
This business grew so rapidly that the Westinghouse Electric
Company (now the Westinghouse Electric and Manufacturing
Company) was organized to take it over. In
1886, the Electric Company bought the Garrison Alley
property from the Union Switch & Signal Company, and
the latter, seeking a new location, purchased the plant of
the old Swissvale Car Works at Swissvale, eight miles east
of Pittsburgh, whence it moved in 1887 and which site it
still occupies.
The business and property of the National Switch and
Signal Company were purchased in 1898. This purchase
ncluded the assets of the Johnson Railroad Signal Company
which had previously been absorbed by the National
Company.
In 1901, the Company completed the erection of a new
plant at Swissvale. A portion of this plant was destroyed
by fire in 1917, but was promptly rebuilt and today the
ndustry boasts one of the most modern and best equipped
‘actories in the Pittsburgh District, with a force of close to
5.000 employees.
The purchase of the total outstanding stock, amounting
lo approximately $6,700,000, by the Westinghouse Air
Brake Company, was consummated in March, 1917, but
the Company still remains under separate management
with the following officers: W. D. Uptegraff, Chairman of
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