I finished the painting in Gaithersburg today. I ended up making the coffee shop sign a cooler and darker gray than the original warm brown it was in the earlier stages (it's a dark brown wood if you see it in person). The street was extended to create the distance in the painting, along with the rough outlines of street lights going back along the streed. In doing so, I was able bring the emphasis back to the bright red of the train signals as they caught the light.
After a frustrating many weeks of finding little time to paint, this was a very satisfying end to my spring painting time.