2009 2010 2013 JMRI James Koretsky Ken Cameron Suzie Tall 1 2010-02-08 JK Initial version 1.1 2012-11-06 KSC Added basic aspect mappings 1.2 2013-12-29 ST Split into different mast types and completed mapping BN-1989 Triple arm semaphore signal As described in the October 1989 Burlington Northern Railroad Southern Region, Debraska Division Timetable #2. In effect at 0001 Continental Mountain Time, Sunday October 29, 1989. Appearances for a three arm semaphore signal used in Automatic Block, CTC and Interlocking Systems Clear green red red Rule 230 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-230-a.gif Advance Approach yellow green red Rule 232 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-232.gif Approach Diverging yellow yellow red Rule 233 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-233.gif Approach yellow red red Rule 236 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-236-a.gif Diverging Clear red red green Rule 237 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-237-b.gif Diverging Approach red red yellow Rule 239 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-239-b.gif Stop red red red Rule 242 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/rule-242.gif Unlit dark dark dark - ../../../resources/icons/smallschematics/aspects/BN-1989/SL-3-high/unlit.gif Stop Stop Stop Unlit Clear Clear Diverging Clear Advance Approach Clear Diverging Clear Approach Diverging Clear Diverging Clear Approach Medium Clear Diverging Clear Approach Restricting Clear Diverging Clear Approach Advance Approach Diverging Clear Diverging Clear Approach Diverging Diverging Clear Diverging Approach Medium Approach Diverging Diverging Clear Diverging Approach Advance Approach Diverging Clear Restricted Proceed Approach Diverging Approach Stop Approach Diverging Approach Unlit Approach Diverging Approach