Apparently, within Caffeine at Geary & Larkin, someone is serving ramen. The details are a little murky, but their Yelp page gives their hours as Fri-Sat, 6 pm - 1 am. Website is http://www.tabetrucks.com/ . I can't tell from the descriptions whether it's a counter, a storefront, or a mobile unit.
Anyone have more details about them or -- even better -- reports on how their ramen is? The Yelp reviews are glowing, for whatever that's worth.