I notice something in each of these wonderful train layout images. There's something red, and red draws my eye to it right away. If one puts a pot of red flowers at the end of the garden, the viewer will immediately look to that pot of flowers. If the pot is pink flowers, the viewer will look around the garden more before looking at it. This is because red is a dominant colour - in the colour wheel it pretty well is king. So check through these images again. I particularly enjoy the playfulness of red long-john underwear, traditionally known as the Union Suit. The Sundance layout modellers have a great sense of humour.
Wikipedia knows all: A union suit is a type of one-piece long underwear. Created in Utica, New York, United States, it originated as women's wear during the 19th-century United Statesclothing reform efforts, as an alternative to constricting garments, and soon gained popularity among men as well. The first union suit was patented in 1868 as "emancipation union under flannel". Traditionally made of red flannel with long arms and long legs, it buttoned up the front and had a button-up flap in the rear covering the buttocks (colloquially known as the "access hatch", "drop seat", "fireman's flap", and other names), allowing the wearer to defecate without removing the garment. Depending on the size, some union suits can have a dozen buttons on the front to be fastened through buttonholes from the neck down to the groin area.