The sun. [volume] (New York [N.Y.]) 1833-1916, 1907-07-07
Prnns,,v snIa Railroads Ne W Express
HauIer.
From hs Scien6fc american.

From ne Scient;fc american.
A truly enormous Express locomotive repre-
SCENTS The latest effort OF one OF our leading
railroads TO keep pace with the ever growing
demands OF its express passenger service.
This company has just received the new
locomotive from the shops. and placed II in
trial service. in The hope that il will prove
equal 10 the task Of handling in one train
psszenge trains which other wise must be
run In two sections several minutes apart,
or Else handled by double-heading " that IL,
coupling no two locomotives at the head Of
a train.
The most powerful Pennsylvania standard
express engines al present in service are them
selves heavy aud powerful machines. with
cylinders twenty-five inches diameter by
twenty-six inches stroke. which. on divisions
having heavy grades. are capable OF success
fully handling trains made mp OF eight Pull
man ears. But the passenger trafic has in
creased 40 rapidly that ten or twelve car trains
are not unusual. The capacity Of the Atlantic
type, with four-cOupled drivers, could not
be increased sufficiently to meet the demands
without adding considerably 10 the weight
on the drivers. To gain the required capacii y,
therefore. IL was found necessary to add an
other pair Of drivers. and adopt what is known
a. he Pacific type OF locomotive. In which the
total necessary adhesive wei ght was realized
without exceeding a load OF sO, 600 pounds on
any one pair OF drivers.
The dimensions OF the new locomotive
greatly exceed anything hitherto built, or that
would have been considered possible a few
years ago. We all remember the great inter-
est which engine 900. built especially for
hauling the Empire State express OF the New
York Central Railroad. excited when she was
exhibited AT the Chicago Worlds Fair. Yet.
to-day 1t would take two OF such en- gines
coupled together to do the work that can be
-. -.
for the latter locomotive. with water in its
boiler and in running condition. weighs 1916
tons it's tender when loaded with II tons Of
coal and 7 tons Of water weig CHS 20 tons. maxi
ing a total for the engine and tender OF 2O+. 8
American tons. or 400. 200 pounds.
In order that the great power Of the loco
motive might he available at fairly high
speeds. the drivers were made 80 inches in
diameter. which Is the same a. that Of the
Atlantic type. The cylinders are ~ inches in
diameter by % inches stoke. and the pist on
valves. which are operated by the Walschaert
gear. are themselves 10 inches In amet err.
The vAve gear. which has been carefully de-
signed With a view to bringing its working
parts into one plane. il provided with a special
supporting frame outside OF the link.
II will readily be understood that TO supply
sufficient steam for cylinders OF this great
capacity nm unusually large boiler was neces-
sary. To begin with. the tubes. which are -.
inches in diameter. are 8 feet longer than
those OF the Atlantic type. or 81 feet over all:
and OF these there are 3t3 whose com bined
heating surface Ia t.Il7 square feet. Al there
are POS square feet in the nrebox, the total
heating surface reaches the area OF
1927 square feet. The coal is burned on n
CRATE whose area is 8i.s square feet. The
maximum diameter Of he barrel Of the boiler
IL 7o', inches. 80 that n man ak feet tall
could walk through The boiler shell. and yet
clear the top Of IL by over half a foot. The
maximum ~tractive power is II 900 pounds, or
49,, tons.