20092010JMRI DickBronson PaulBender 1 2010-01-01 DB Initial version 2 2010-01-12 PAB Adapted from NYCS-1937 SLSF Single searchlight absolute signal As described in the July 1978 Revision of the St. Louis San Francisco Railway Company publication "RULES for the Maintenance of way and Structures" effective July 1,1973, chapter titled Description of Signals. As noted in the source material, these rules are rules of the Frisco Transportation department. Appearances for a single-searchlight signal head with number plate Clear green Page 16 Approach yellow Page 16 Approach Medium flashyellow Page 16 Restricting lunar Page 18 Stop red Page 20