Both Uses

although
in
A Streetcar Named Desire
(Auto-generated)

If you want to know anything more about that, you can get in touch with Reverend Walker about it, although I'm afraid he won't be likely to show much cordiality to you.†
Scene 1.1 *

although = even though -- used to connect contrasting ideas
There was something different about the boy, a nervousness, a softness and tenderness which wasn't like a man's, although he wasn't the least bit effeminate-looking — still — that thing was there.†
Scene 3.6

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)