2009 2010 2013 JMRI Suzie Tall James Koretsky Ken Cameron 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-1989 Single head searchlight 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 single head searchlight signal or semaphore used in Automatic Block, CTC and Interlocking Systems Clear green Rule 230 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/rule-230.gif Approach yellow Rule 236 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/rule-236.gif Approach Medium flashyellow Rule 234 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/rule-234.gif Restricted Proceed flashred Rule 241 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/rule-241-a.gif Stop red Rule 242 ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/rule-242.gif Unlit dark - ../../../resources/icons/smallschematics/aspects/BN-1989/SL-1-high/unlit.gif Restricted Proceed Restricted Proceed Stop Unlit Clear Clear Advance Approach Clear Approach Diverging Clear Approach Medium Clear Approach Restricting Clear Approach Approach Medium Diverging Clear Clear Diverging Approach Medium Clear Diverging Approach Approach Medium Restricted Proceed Approach Stop Approach Unlit Approach