make/data/tzdata/northamerica

@@ -46,25 +46,24 @@
 # His pamphlet "A System of National Time for Railroads" (1870)
 # was the result of his proposals at the Convention of Railroad Trunk Lines
 # in New York City (1869-10).  His 1870 proposal was based on Washington, DC,
 # but in 1872-05 he moved the proposed origin to Greenwich.
 
-# From Paul Eggert (2016-09-21):
+# From Paul Eggert (2018-03-20):
 # Dowd's proposal left many details unresolved, such as where to draw
 # lines between time zones.  The key individual who made time zones
 # work in the US was William Frederick Allen - railway engineer,
 # managing editor of the Travelers' Guide, and secretary of the
 # General Time Convention, a railway standardization group.  Allen
 # spent months in dialogs with scientific and railway leaders,
 # developed a workable plan to institute time zones, and presented it
 # to the General Time Convention on 1883-04-11, saying that his plan
 # meant "local time would be practically abolished" - a plus for
 # railway scheduling.  By the next convention on 1883-10-11 nearly all
-# railroads had agreed and it took effect on 1883-11-18 at 12:00.
-# That Sunday was called the "day of two noons", as the eastern parts
-# of the new zones observed noon twice.  Allen witnessed the
-# transition in New York City, writing:
+# railroads had agreed and it took effect on 1883-11-18.  That Sunday
+# was called the "day of two noons", as some locations observed noon
+# twice.  Allen witnessed the transition in New York City, writing:
 #
 #   I heard the bells of St. Paul's strike on the old time.  Four
 #   minutes later, obedient to the electrical signal from the Naval
 #   Observatory ... the time-ball made its rapid descent, the chimes
 #   of old Trinity rang twelve measured strokes, and local time was

@@ -445,12 +444,11 @@
 
 # From Andy Lipscomb (2011-01-24):
 # ...according to the Census Bureau, the largest city is Beulah (although
 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
 # largest city in Mercer County).  Google Maps places Beulah's city hall
-# at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
-# of 6h47'07".
+# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
 
 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
                         -7:00   US      M%sT    2010 Nov  7  2:00
                         -6:00   US      C%sT
 

@@ -479,11 +477,11 @@
 # US Pacific time, represented by Los Angeles
 #
 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
 # north of the Salmon River, and the towns of Burgdorf and Warren),
-# Nevada (except West Wendover), Oregon (except the northern 3/4 of
+# Nevada (except West Wendover), Oregon (except the northern ¾ of
 # Malheur county), and Washington
 
 # From Paul Eggert (2016-08-20):
 # In early February 1948, in response to California's electricity shortage,
 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,

@@ -977,10 +975,17 @@
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1973
                         -5:00   -       EST     2006
                         -5:00   US      E%sT
 
+# From Paul Eggert (2018-03-20):
+# The Louisville & Nashville Railroad's 1883-11-18 change occurred at
+# 10:00 old local time; train were supposed to come to a standstill
+# for precisely 18 minutes.  See Bartky Fig. 1 (page 50).  It is not
+# clear how this matched civil time in Louisville, so for now continue
+# to assume Louisville switched at noon new local time, like New York.
+#
 # Part of Kentucky left its clocks alone in 1974.
 # This also includes Clark, Floyd, and Harrison counties in Indiana.
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule Louisville 1921    only    -       May     1       2:00    1:00    D
 Rule Louisville 1921    only    -       Sep     1       2:00    0       S

@@ -3285,12 +3290,12 @@
 # Haile Selassie, Emperor of Ethiopia.  See:
 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
 #
 # Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
-Zone    America/Jamaica -5:07:11 -      LMT     1890        # Kingston
-                        -5:07:11 -      KMT     1912 Feb    # Kingston Mean Time
+Zone    America/Jamaica -5:07:10 -      LMT     1890        # Kingston
+                        -5:07:10 -      KMT     1912 Feb    # Kingston Mean Time
                         -5:00   -       EST     1974
                         -5:00   US      E%sT    1984
                         -5:00   -       EST
 
 # Martinique

@@ -3436,11 +3441,11 @@
 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
 #
 # Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Grand_Turk -4:44:32 -      LMT     1890
-                        -5:07:11 -      KMT     1912 Feb # Kingston Mean Time
+                        -5:07:10 -      KMT     1912 Feb # Kingston Mean Time
                         -5:00   -       EST     1979
                         -5:00   US      E%sT    2015 Nov Sun>=1 2:00
                         -4:00   -       AST     2018 Mar 11 3:00
                         -5:00   US      E%sT