Check in the pristine copy of ICU 4.6...

icu46/source/data/brkitr/title.txt

+# Copyright (c) 2002-2003, International Business Machines Corporation and
+# others. All Rights Reserved.
+#
+#  Title Casing Break Rules
+#
+
+$CaseIgnorable   = [[:Mn:][:Me:][:Cf:][:Lm:][:Sk:] \u0027 \u00AD \u2019];
+$Cased           = [[:Upper_Case:][:Lower_Case:][:Lt:]  - $CaseIgnorable];
+$NotCased        = [^ $Cased];
+
+#
+#  If the iterator was not stopped on a cased character, advance it to the first cased char
+#
+$NotCased+;
+
+#
+#  If the iterator starts on a cased item, advance through all adjacent cased items plus
+#    any non-cased stuff, to reach the start of the next word.
+#
+$Cased ($Cased | $CaseIgnorable)* $NotCased*;
+
+#
+#  Reverse Rules
+#
+
+! $NotCased+;
+
+#
+#  If the iterator starts on a cased item, advance through all adjacent cased items plus
+#    any non-cased stuff, to reach the start of the next word.
+#
+! $NotCased* ($Cased | $CaseIgnorable)* $Cased;