LIRR Signal Photos
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Signal bridges were usually numbered west to east. Automatic block signals (and distant signals) were usually numbered to the nearest milepost and all originally had a prefix letter for the branch, as follows:

B-Bay Ridge
E-West Hempstead (NY Bay Extension RR), no automatic signals but a few distant signals.
F-Far Rockaway
G-Main Line (later, no prefix letter)
M-Montauk Cut-Off
WestboundSmashboardDutchKillsDBCabin06-1981_S.Goldstein.jpg (54857 bytes) Smash board and eastbound Signal #006 at Dutch Kills Drawbridge (swing bridge). 
 View southeast at Dutch Kills 06/1981
 Photo: S. Goldstein




N-Port Washington (North Side)
O-Oyster Bay
P-Port Jefferson
R-Rockaway Beach
S-Montauk (South Side RR)

For example, signal S243 would be nearest to milepost 24.3. Also, even numbered signals are usually eastbound and odd numbered westbound.  Info: Jeff Erlitz

Amityville-Copiague-Linderhurst was the "test site" for no wayside automatic block signals. It was probably designed in 1968 or before since the shoo-fly tracks for this section were placed in service in October 1968. I'm guessing that the railroad did not know for sure that the FRA, or whoever, was going to approve the use of no wayside automatics so they designed the new elevated with the provision for them. This was the first section of railroad to operate under Rule 410.

The following year, in May 1974, the automatics came out of service from Queens to Divide and in November 1974 from Hall to Queens.

Oyster Bay Branch, Montauk Branch from Babylon to Y and west of Jamaica are the last bastions of automatic block signals, Rule 251. Of course, the Main Line west of Jamaica also but that's not 251 territory.

The Central branch still has its automatic block signals, such as C229 distant signal to Beth. It's your basic Rule 261 automatic block signal system with out speed control.

The automatic block signals for the Atlantic branch between Hall and Valley were replaced in the late 1990's, about the same time Hempstead branch automatic block signals were replaced.

Far Rockaway Branch lost its automatics 2/4/1984.

Long Beach Branch lost its automatics 12/2/1982.

Hempstead Branch was after 1990                                                    Research: Jeff Erlitz

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Bellrose 02/14/2008
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LIRR new signal installation Patchogue  04-29-2006 Photo: Paul Strubeck


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JS interlocking east Deer Park
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Position light at dusk Photo: Joe Tischner


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End Of Block Port Jefferson 09/1985


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MP34 Central Extension 10/23/2010 
Photo: Al Castelli
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View Track 1 platform east Seaford 06-27-09
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View East from Wantagh Station 03/23/2009

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Cannonball westbound under signal bridge #18
LI CIty  05/11/2010 Photo: Joe Tischner

st signal: unidentified
2nd signal = #18
3rd signal  = #N18  (Port Washington Branch)
4th signal  = #NY248 (NYCRR)  

Signal bridge #18 east side of “HAROLD” tower (or where HAROLD used to be) at the loop tracks leading into Sunnyside yard, close to 42nd street in Woodside, Queens.
Research: Dave Keller