20092010JMRI
DickBronson
PaulBender
1
2010-01-01
DB
Initial version
2
2010-01-12
PAB
Adapted from NYCS-1937
3
2013-7-9
PAB
Add Aspect Mapping
4
2013-7-10
PAB
Add Signal Icons
5
2019-03-17
PAB
fix image links
SLSF
Double searchlight permissive 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 two-searchlight signal head with number plate
Clear
green
red
281
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-281.gif
Advance Approach
yellow
yellow
Rule 282
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-282.gif
Approach Medium
yellow
green
Rule 284
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-284.gif
Approach
yellow
red
Rule 285
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-285.gif
Diverging Clear
red
green
Rule 286
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-286.gif
Diverging Approach
red
yellow
Rule 287
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-287.gif
Restricting
lunar
red
Rule 288
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-288-a.gif
Stop and Proceed
red
red
Rule 290
../../../resources/icons/smallschematics/aspects/SLSF-1973/SL-2-high/rule-290.gif
Stop and Proceed
Stop and Proceed
Stop
Approach
Stop and Proceed
Approach
Grade
Approach
Restricting
Approach
Diverging Approach
Approach Medium
Diverging Clear
Approach Medium
Approach
Advance Approach
Approach Medium
Clear
Approach Limited
Clear
Advance Approach
Clear
Clear
Clear