A bit of a murky one, this, as a 4 second exposure under room lighting was needed to show off the loco lights. I've replaced the dim yellow LEDs in the two SOO locos with bright white equivalents - the Union Pacific loco in the middle shows the old LEDs for comparison purposes.
I had planned to fit lights to a Lima Class 67 today, but these American locos jumped the queue. A couple of years ago I blew several components on their circuit boards by carelessly connecting a higher voltage LGB controller to the test track and repair work was long overdue.