Opening earlier this year, this daytime coffee cubbyhole/pop-up might remind you of the Cafe Lambretta chain of miniscule coffee shops that dot the South of Market. But instead of Blue Bottle Coffee they serve Ritual Coffee Roasters.

As a daytime front to the Romper Room bar, they also offer the option to spike your coffee drink as a variety of caffè corretti (Italian for corrected coffee). All of which seems suitable for a bar, even if it now seems to follow the current fad of serving coffee in formats that degrade or mask its core quality — e.g., nitro brews, coffee cocktails, partially extracted cold brews with two-week shelf-lives — under the false pretense of “craft coffee”.

Iron Horse Coffee Bar resides in the daytime entrance of Romper Room Service counter inside Iron Horse Coffee Bar

You’ll find Iron Horse Coffee Bar in the pedestrian-friendly Maiden Lane alleyway by the “Coffee that doesn’t suck” signs — perhaps a less lame version of “World’s Best Cup of Coffee” for a modern era — placed around the feeding streets and walkways on its perimeter. You’ll also notice it by the two baby blue café tables in the middle of the street out front of the Romper Room entrance.

Named after the restaurant that stood here in 1950, the service counter barely takes up the front entrance with a sign, a two-group La Marzocco GB5, large bags of Ritual, alcohol bottles, and a few Lucky Charms cereal bowls. For indoor seating you can sit at one of the barstools at a counter that runs along the opposite wall.

Pastries on display inside the tiny entrance to Iron Horse Coffee Bar Inside the Romper Room (nice inflatables) withbar stool seating for sipping Iron Horse coffee inside

Using Ritual’s Ursa Major blend, they pulled shots with a striped darker and medium brown crema. It’s pulled as a rather long shot, but it still holds up in body — so they’re definitely not stinging on their portafilter dosing. Even so, at $3 served in a paper cup at a pop-up with no amenities (hello, $3 club), there is absolutely no reason they should be charging the exorbitantly highest rates for espresso shots in all of SF. This is a temporary coffee dive along Maiden Lane — not some tourist fleecing station inside the gates of DisneyWorld.

The quality is decent but nothing special. It has flavors of pungent herbs and some spice and surprisingly limited acidic brightness for Ritual. Unless you want to “correct” your coffee, enjoy sitting in Maiden Lane, or it’s just too convenient, I would keep walking.

Read the review of Iron Horse Coffee Bar in Union Square.

Outdoor seating in Maiden Lane in front of Iron Horse Coffee Bar The Iron Horse Coffee Bar espresso - not worth the $3 price tag