200920102018JMRI DickBronson BobJacobsen jake@physics.berkeley.edu 1 2010-01-01 DB Initial version 1.1 2011-06-24 DB Added mapping information 1.2 2018-06-22 DB Updated for PRR 1956 PRR 1956 Single position light high absolute signal As described in the October 1956 version of the PRR publication "Rules for conducting transportation", Signal Rules. Appearances for single position light signal head without other badging. Clear green Page 54 ../../../resources/icons/smallschematics/aspects/PRR-1956/PL-1-high-abs/rule-281.gif Approach yellow Page 59 ../../../resources/icons/smallschematics/aspects/PRR-1956/PL-1-high-abs/rule-285.gif Permissive Block lunar Page 63 ../../../resources/icons/smallschematics/aspects/PRR-1956/PL-1-high-abs/rule-289.gif Stop red Page 66 ../../../resources/icons/smallschematics/aspects/PRR-1956/PL-1-high-abs/rule-292.gif Stop Stop Clear Block Clear Clear Clear Approach Medium Clear Medium Clear Clear Medium Approach Clear Approach Slow Clear Approach Clear Caution Clear Slow Clear Clear Slow Approach Clear Permissive Block Approach Restricting Approach Stop and Proceed Approach Stop Approach