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-1989
Double head searchlight permissive 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 head smaphore signal mast used in Automatic Block 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
Restricted Proceed
red
red
Rule 241
../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/rule-241-f.gif
Unlit
dark
dark
-
../../../resources/icons/smallschematics/aspects/BN-1989/SL-2-high/unlit.gif
Restricted Proceed
Restricted Proceed
Restricted Proceed
Unlit
Clear
Clear
Diverging Clear
Advance Approach
Clear
Diverging Clear
Approach Diverging
Clear
Diverging Clear
Approach Medium
Clear
Diverging Clear
Approach Restricting
Clear
Diverging Clear
Approach
Advance Approach
Diverging Clear
Diverging Clear
Approach Diverging
Diverging Clear
Diverging Approach Medium
Approach Diverging
Diverging Clear
Diverging Approach
Advance Approach
Diverging Clear
Restricted Proceed
Approach
Diverging Approach
Stop
Approach
Diverging Approach
Unlit
Approach
Diverging Approach