"The Tucumcari landmark Rock Island-Southern Pacific depot opened in 1927, when Tucumcari was enjoying the rise of auto traffic on old Route 66. Built in the Spanish Mission-style, this depot is massively long, encompassing both a large passenger area and a significant freight area under one roof."
(https://www.waymarking.com/waymarks/WMM9TE_Rock_Island_Southern_Pacific_RR_Depot_Tucumcari_NM)
The second building highlighted here today (of many, many noteworthy architectural/historic buildings in Tucumcari) is the home of the Bowen Electric Corporation, with not simply one mural wall but all walls of the complicated building decorated with brightly colored, stylized Southwestern images.