I couldn't believe our luck! While out running errands yesterday, we were stopped by a train...a YELLOW TRAIN!
I was so glad I had my camera with me, and Luke was so excited to see a yellow train.
It's really amazing how quickly Luke is learning his colors just by focusing on one color at a time.
Yellow has been more difficult, however, and I think we'll concentrate on yellow for another week before we move on to learning another color.