I have a Lionel 6-82285, SP SD40-2 #8402.
Today I had it on my bench for oil and grease. As I was running it in I noticed that the large (steam locomotive) light on either end do not light. while I have had this locomotive for a few years I never noticed these lights. Looking at it closely, I see it has a red lens and appears to have a bulb behind it. Looking at the manual, I see nothing about turning these lights on or off.
Are they supposed to light?