As far as color scheme goes, Arlington’s Metro 29 Diner delivers everything I want out of a primo diner experience: chrome, turquoise blue, and a smattering of magenta. In matters of cuisine, the eatery on, yes, Route 29 (just east of Glebe Road) is just as satisfying, with one of those endless menus where you’re somehow glad you’ll always have the option to order broiled baby beef liver with choice of onions or bacon, even though you always order the tuna melt. (Or the matzo ball soup. Or the souvlaki. Or the spinach pie. Or pretty much anything Greek at this Greek-owned operation.) What Metro 29 thankfully lacks is an overdose of ‘50s nostalgia. No Paul Anka–packed jukebox, just decent eats in clean environs surrounded by a big parking lot at prices not quite as low and at hours not quite as long as you’ll get at Bob and Edith’s.