Albuquerque morning journal. [volume] (Albuquerque, N.M.) 1903-1926, 1909-12-12
.MALLET ENGINES
TO REvOLUT|0N|zE
MOTIVE POWER
BECOMING POPULAR
ON BIG RAILROADS
Use Of AfticuIated Machines IN
stead of Consolidation One
Of Most Far Reaching Chang
es in Locomotive Practice,

tives on western lines, SAYS the Rail-
road Age Gazette. These Mallet en-
gines have proved so successful and
have showed such remarkable fuel
economy as compared With the large
consolidation engines previously used
in service hat smaller a|rticulated en-
gines have been ordered for road scrv-
ice where there are ! per cent grades.
These proved So economical thai in
Nav. Ig0S. 81 Mallet engines were or
dercd, IL having been decided u eX-
tend the use Of them to districts hav-
ing grades as low as ore per cent.
The recent decision 10 convert tho
consultations into a%rticulated. loco
motives is one Of tho most surprising
and far reaching movements in Loco
motive practice ever Witnessed IN this
country. The Great Northern Is re-
.ceivinE from the baldwin works the
front engine with compound cylinders.
which is intended TO he coupled 10 one
OF the old consolidation engines We
have already referred To. and the com
bination viii he what we have termed
IA Converted Mailet locomotive. The
fircbox. boiler cylinder and running
&NNi 9 iNtNA NhNtrtAAelAAlHtt EftflftlH I'M
The Emerson ~superhcater win
be fitted 10 the smnkebox and the new
boiler shell of the front engine viii he
fastened Il Il. This new shell viii not
have any direct evaporating surface.
but will be filled with Tubes and used
as a feed-water heater. thus utilizing
"A portion OF the heat from the waste
gases which passed out Of the stack
Of the simple engine The compound
cylinders in slow freight service Will
produce some additional saving In
steam and fuel. 50 that the total econ
amy OF the complete locomotive VIII
he such that Il Is expected hat the
CRATE surface and heating surface Of
tho original simple consolidation m
gine will he sufficient To furnish steam
for the larger and heavier ar%tlculated
engine
Tho cylinders of the consolidation
engines are 22X90 in. driving wheels.
So IN, weight on drivers, fSG.00 lbs. !
total heating surface. 2.16S 81. feet. |
CRATE area. 81 50 II. The large Mall
let engines on the Great Northern
have high pressure cylinder ~ l-2xs2
in a heating surface of $500 81. IT.
and a CRATE area of IS 50. Il. while the
Mallet engine for ordinary road serS-
I've have high pressure cylinders 20N
a0 I'm. heating OF 3alt 81. f.. and CRATE
Of 90 81. H. Tho converted Nal
let locomotive viii have the same cyl
inders, heating surface and CRATE area
as tho old consolidation. and while 1t
may be said that the heating surface 1
and CRATE area should now be suffi-
49,. - ... a. As-A .- \
sure cylinders as before, yet the new
converted locomotive viii be much
larger and heavier. with more weight
drivers and greater t~ractivo power,
50 thai whatever additional heat Is
absorbed 10y the engines must Doc de-
from the superior economy Of
the compound cylinders. from the adj
vantage OF the superheatcr and the
saving due 10 the fecd-water heater
Fuel savers.
The high pressure cylinders and
crate ares OF the smaller Malets on
Great Northern are smaller than
those OF tho consultations. hut the
.ounnge rating has hcen increased
nearly 81 per cent and p fuel saving
on the ton-milc basis OF 81 per cent is
obtained ON the divisions having ! per
cent grades 4 large proportion of
his SAVING in fuel must DE attributed
.n thc economy of The compound cyl-
nders The s1Vina Of 30 per cent fuel
Aas obtained ON tho > per ccit,
grades. where tine speed WAS ncCesstr
h yer, SLOW The advantage 10 he
from the s~uperhcatcr In fuel
economy can De- taken as IS Co 20 per
sent
Recent tests ou thc santa Fc show
.hat the latter figure has been oh-
ained. hut Il is probable that S por- W..
of this saViuE ls due te the ar
anCem,nt of hr draft riggins. which
iispruses with the haffle plate amt
ef TIRE U.S. eft largc cNhsnsl
and reduces tho loss from un-
consumed iuoi discharged throueh the \
|,
Topeka Made Test. N
Tho cconoiu ~ f,cf-water heaters
or locomotives has been frequently