Illinois Central Gulf 1985 theme from Railroad Signals of the US website based on SpDrS60 theme. The following signal masts are supported:-

Prefix	Mast type
	(light) Single head searchlight mast automatic
	(semaphore) Position light mast automatic
1a_	Single head mast standard head aspect numbers
1_	Single head mast unified ICG aspect numbers
2_	Twin head mast unified ICG aspect numbers
3_	Triple head mast unified ICG aspect numbers
p_	Position light mast unified ICG aspect numbers
pb_	position light mast B&O aspect numbers

Automatic aspect numbers
-r	R292	red
-y	R285	yellow
-g	R281	green
-w	R290/1A	lunar
-b	-	unlit


Standard head aspect numbers
-0	R291/2	red
-1	R285	yellow
-2	R405	green
-3	R291A	lunar
-5	R282	flashing yellow
-8	-	unlit

Unified ICG aspect numbers
-0	R292	red / (red) / (red) or red
-1	R291A	Lunar / (red) / (red)
-2	R291A	(red) / lunar / (red)
-3	R291A	(red) / (red) / lunar
-4	R291	red / (red) / (red) or top over red
-5	R290	(red) / (red) / lunar or lunar
-6	R289	red / red / yellow or yellow
-7	R288	red / red / green or green
-8	R287	red / yellow / (red) or bottom under yellow
-9	R286	red / green / (red) or bottom under green
-10	R285	yellow / (red) / (red) or top over yellow
-11	R284	yellow / yellow / (red)
-12	R283	yellow / green / (red) or left over green
-13	R282	flashing yellow / (red) / (red)
-14	R281	green / (red) / (red) or top over green
-15	-	unlit

B&O aspect numbers (displays ICG rules on B&O signal hardware)
-0	R292	red
-1	R291	top over red
-2	R290	lunar
-3	R289	yellow
-4	R288	green
-5	-	not used
-6	R287	bottom under yellow
-7	R285	top over yellow
-8	-	not used
-9	-	not used
-10	-	not used
-11	R286	bottom under green
-12	R283	left over green
-13	-	not used
-14	-	not used
-15	R281	top over green
-16	-	unlit



