The San Francisco call. [volume] (San Francisco [Calif.]) 1895-1913, 1913-10-11
PROJECT IS
s4,0()O,000
TASK
Ad0lph Sutro the First to See
Possibilities in Underground
Extension

cluster of dunes and sandy hills far
outside of what was then the city
limits, beyond the Mission Dolores,
and there established a tree set oasis.
than conquered the wind and sand
and brought his message of peace and
prosperity to San Francisco of today.
This big undertaking, which will
cost 100000, So per cent of the
cost of which is being borne by
property owners west of the peaks,
is considered essentially a San Fran
cisco measure. 1t is freely predicted
that il will increase the city's popuz
lation 100000 in the next two years
In other cities. such as New York,
Boston and Los Angeles. where tun-
nels have been built extensively In
the last 10 years. tremendous develop
ments have followed the opening up
Of new lines of transportation
through such subways.
The tunnel VIII be about 10000 feet
in length from Market and Seven
teenth streets to its southwesterly
extremity. OF this length $3.50 feet
viii Re in solid rock. and the re-
maindsr win be bored through soft
material. Nineteen hundred feet of
right OF way has been secured be-
tween Market and Seventeenth streets
and Hattie and Eighteenth streets,
the price of this land and improve
ments representing the greater part
Of the damages.
The general grade Of the tunnel is
easy, according to the plans of City
Engineer NJ. NJ O'Shaughnessy, no.
where exceeding s per cent. so that
high seeds for electric cars can be
made.
1t is estimated that the time in
passing through the tunnel. including
stop t Laguna Honda, in the For
est Hinproperty. viii be less than 10
minutes
Exhaustive borings have been made
al along the route. 500 feet apart, to
determine the exact nature of the
material that will be encountered in
AiohthS 1T bO4cs ~ tHdA Liz So4i-
tractors TiH not have to bid blindly
on the Get of the work
All tutng and the pipes for cleo
trio wiref are carried In the concrete
sidewalk and inches for operating
these are spaced every 400 feet apart.
Similar efuge inches are placed on
each size, so feet apart. for the
safety laborers who may be work
ing in ne tunnel
An eLborate system Of ventilating
Is to beprovided by means of a sepa-
rate compartment on the top of the
tunnel about FIVE feet high. through
which Ii the foul air will be ex-
lracted by means of fans.
AmpH stairways and exits are pro-
vided FIR the Eureka valley and La
guna LINDA stations. and provision is
made b which elevators may be in
stalled.
With the completion of Twin peaks
tunnel and the Inauguration of rapid
transit through the subway and bore
Of the largest municipal tunnel for
suburban traffic in the world. passen-
gers wiz experience the sensation Of
being transported at express train
lpeed. Tie length of the tunnel Will
be 1900 bet, and it is estimated that
The running time of the electric trains
VIII be from s to 10 minutes.
The eastrly portal Of the tunnel
VIII be at he intersection of Seven
eenth, Caste and Market streets The
westerly portal will be about 5000
leet west of he intersection of Dewey
boulevard ard Seventh avenue extern
lion, in Foret Hill.
There will be two points between
he easterly.an westerly portals at
which passengers can enter or leave
4 The tunnel The first one in going
vest will b. the Eureka valley sta
ion. which will be located near Eu-
.eka between Seventeenth and Eight
enth streets.
Kiosks VII be placed on the street
At the Eureka valley station,
With easy stairways leading to and
rom the tunnel, which at this point
viii only be 20 feet below the sur
ace Of ths street. This situation is
dmilar tofsubway stations in other
dties, and'will be large. commodious
IND reaSonapiy ornate
At the Laguna Honda station.
rhere thetunnei viii be about so feet
elow the surface, there will be an
IMPOSING building equipped with six
iIevators to carry passengers to and
rom the surface to the tunnel level
these elevators have a capacity of so
,ersons each. and the time consumed
the tfp from the surface to the
unnel le-el viii be less than 80 sec
!nds.
The dictator will be constructed and
perated 1t the expense of the city in
ase a municipal line is operated
Trough tae tunnel, which Is highly
robable. 5r by any railroad company
eceiving a franchise or privilege to
perate line through the tunnel
fnder tle terms Of the charter an ex-
iusive danchise can not be granted
q any rA.road company.
The letel Of the tunnel at the In
.rsectioIi of Seventeenth and Market
reefs VIII be constructed SO as to
Omit of tie continuation Of a sub
,av under Market street as far east
rIv as may be practicable; IL not
the ferr3 at least as far as Kearny
nd Marke streets. 1t is believed
lat this stbwayf Will follow the con-
iruction o. Twin peaks tunnel and
i'll be a rality IN 10 years.
1t has ben suggested that to re-
eve congestion in Market street the
lbway might begin at Market and
} eyenteentl streets, thence under
larlset to. Mccoppin street, thence
nder this street to Mission street
nd undg- Mission to some easterly
pint.