New-York tribune., 1904-10-23

per cent, and the overlap made not less than 697
feet. With this length of overlap the home signals
could be located 697 feet apart. and the block sec
tion length would he double this 1884 feet. The
average length of overaps laid out, is about $50
feet. and the length of block sections double this.
The block signalling system ms installed consists of
the automatic overlapping system above described
applied TO the express tracks between city Hall
6c ynGTeSH es %t 'Cf d l 10 e
tanCe Of two and one-haf miles. This third track
is placed between the two local tracks and will be
used for express traffic in both directions trains
moving toward the City Hall in the morning and In
the opposite direction al night also the two tracks
from One-hundred- and -fOrty-hfth-st: TO Dyckman-
St; distance of two and one-half miles. or hve
ed by signals is twenty-four ana one-half miles
The small amount of available space in the sub
way made II necessary To design specia! LoIin ot
the signal itself. ClearanceS would not permit OF
on rha pGeg Is was not Snabe oT the lighting
conditions OF the subway y color signal was there.
the American Railway Association; 1t consists Of
an IRON case ntied with two Whlte lenses me IpI
Suitable colored glasses are mounted IN sndes;
which are operated by pneumatic cylinders placed
in The base Of the case Home ana dwarf signals
show red light for the danger or stop indlca-
caution" indication. All signals show a green
hght for the proceed or clear position. signals
ric lights placed back OF each white lens SO that
elevated structure, semaphore signals OF the usual
type are used The signal lighting is supplied by a
the power and general lighting circuits.
with the signalling may be here described. The
first IS emergency train stop. It IS designed 10
place In the hands of station attendants others
afforded is similar in principle the emergency
brake handle found ia all passenger cars. hut
operates 10 warn all trains of an extra EeOJs dan
ger condition. II has been shown in electric rail
roading that accident apparatus. perhaps Of
slight moment, cause unreaSouing panic
on account OF which passengers may wander on
adjoining tracks IN face Of approaching trains. 10
provide as perfectly practicable FOR such condi-
lions has been arranged TO loon the control of
signals into an emergency box set in a conspicuous
position in each stauJn platform. ! he pushing Of
a button this hOX similar TO that Of the fire
alarm sigral will set all signals Immediately
adjacent TO stations in the face Of trains ap-
preaching. that ali aflc be stopped until
the danger condition is removed
The second safety appliance is the section
lreak" protection. This consists of special
emergency signal placed IN advance of each
s-Ia rate section of the third rail- that is. points
where trains move from a section fed by sub
station to that fed by another Under such Condi-
tions the contact shoes of the train temporarily
span the break in the third rail. IN Of
serious overload or ground on one section. the
traty wiring would morHer tarilv act feeder
for The section, and thus possibly blow the train
f,,ses and cause delav. In order. therefore
vent trains lassins into dangerously overloaded
eectfon an overload relay has teen installed
each section break 70 set stop" signal in the
fec ~ an approaching trn'n- which holds the
train until the abnormal condition is removed.