Same word as main line:

aristocracy, beautiful people, best, blue blood, carriage trade, celebrity, choice, country club set, cream, crowd, crème de la crème, elect, establishment, fast lane, fat, flower, gentility, gentry, glitterati, high society, in-crowd, jet-set, main line, nobility, old money, optimacy, pride, prime, prize, quality, select, society, top, upper class, upper crust