2009 2010 2013 JMRI James Koretsky Ken Cameron Suzie Tall 1 2012-08-31 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 Double arm semaphore signal As described in the October 1989 Burlington Northern Railroad Southern Region, Nebraska Division Timetable #2. In effect at 0001 Continental Mountain Time, Sunday October 29, 1989. Appearances for a double arm semaphore signal mast used in Automatic Block, CTC and Interlocking Systems Clear green red Rule 230 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-230-a.gif Advance Approach yellow green Rule 232 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-232.gif Approach Diverging yellow yellow Rule 233 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-233.gif Approach yellow red Rule 236 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-236-a.gif Diverging Clear red green Rule 237 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-237.gif Diverging Approach red yellow Rule 239 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-239.gif Stop red red Rule 242 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-242-a.gif Unlit dark dark Rule 242 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/unlit.gif Stop Stop Stop Unlit Clear Clear Advance Approach Clear Approach Diverging Clear Approach Medium Clear Approach Restricting Clear Approach Advance Approach Diverging Clear Approach Diverging Diverging Approach Medium Approach Diverging Diverging Approach Approach Diverging Restricted Proceed Approach Stop Approach Diverging Approach Unlit Approach Diverging Approach