Amtrak Northeast corridor theme from railroad signals of the US website based on SpDrS60 theme. 

Automatic aspect numbers for 3 or 4 aspects
-r	R292	red over dark
-y	R285	yellow over dark
-g	R281	green over dark
-w	R290	red over lunar
-b	-	unlit

Amtrak aspect numbers for 16 aspects twin head
-0	R292	red over dark
-1	-	not used
-2	R291	red over white
-3	R290	red over lunar
-4	R288	red over yellow
-5	R286	red over flashing yellow
-6	R285	yellow over dark
-7	R284	yellow over yellow
-8	R283	red over green
-9	R282a	flashing yellow over dark
-10	R282	yellow over green
-11	R281c	red over flashing green
-12	R281b	yellow over flashing green
-13	R281a	flashing green over dark
-14	R281	green over dark
-15	-	unlit

Standard aspect numbers for single head with prefix 1_

-0	R292	red
-1	R285	yellow
-2	R281	green
-5	R282a	flashing yellow
-6	R281a	flashing green
