I also had one in Berlin and was gravely disappointed. Luckily, I found a beer garden the next day that had amazing sausages of many varieties.
I usually agree with you on food stuff but not this time.
I tried it twice when I was there. The first time was on a train. It was a bland, presliced frankfurter in lousy ketchup with some curry powder blended in. It looked and tasted like it would be right at home on a toddler’s highchair. I figured a train might not be the best place to judge so gave another try ats an appetizer at a restaurant. Same thing except the sausage wasn’t sliced.
What I really regret missing in Berlin is döner kebab.
Oh, good Lord. There is nothing like a Berlin-style döner. That shit is something amazing. That bread/pita…
The idea of getting a currywurst at a restaurant just gives me the giggles. I am not at all German or that culturally in-tune with Germany, but, to me, of all my many visits to Germany, it’s something to get at some outdoor stand, like you would a Sabrett’s hot dog in New York. There’s something just delicious and comforting about it. It’s not the bliss of a Thuringer Rostbratwurst from a vendor in a square in Erfurt, but it’s got its charm. The curry-ketchup and the sprinkle of curry powder on pre-sliced knackwurst (or whatever sausage). The little fork to eat it with. The fries. One of the few places I accept ketchup on a sausage. 
A&W? I’ve seen them in various places in the US, though not sure how popular they are anymore. There is one I’ve seen still open in my state, however, so they must still be a thing…and they certainly sell hot dogs. Der Wienerschnitzel is also all over, and that would have been my first choice, though I dislike the turkey hot dogs they have gone to…as well as the fact that most of them have closed, at least in my area. Other than that…Sonic has hot dogs, though they aren’t very good IMHO.
I think there may be a few Weiner Kings hanging on.
Do you mean…a hot dog bun?
Note that I’m in new England. I have heard that some places cut their hot dog buns on the side, instead of the top. Which seems weird… How are they baked and packaged? But probably inconsequential as to how they contain hot dogs.
In Ontario, a hot dog bun is a separate top and bottom half. Although sometimes connected by a thin bridge of bun, this often breaks, allowing a “free Willy” situation. In Quebec, hot dog buns are a single bun with a slit in the top. It’s more practical, since the hot dog cannot escape.
Don’t even ask Canadians about bags of milk - available in most provinces.
Yes, as puzzlegal alluded, New England hot dog buns have the slit along the top and are unlike the hot dog buns anywhere else in the nation. A “normal” bun (for the vast majority of the US) is one slit horizontally. Unlike your description, though, it should not break apart. I cannot remember a time I’ve had a hot dog from a hot dog stand or vendor here in Chicago break on me, no matter the toppings. Maybe some cheap store-brand buns for home consumption.
The first time I saw a New-England-style bun in Massachusetts, I was completely not expecting it. I actually thought is was some weird-ass half-sized white bread cut halfway down the middle every other slice. But the nice thing is, they toast up nicely on the sides, so they’ve got that going for them.
For those who don’t know, this is what a New England bun looks like:
A sign of aging, perhaps. In my youth, the local Lions Club would have all-you-can-eat pancake suppers, and my high school friends and I would go to town.
I was recently in Vegas visiting my son and we had breakfast at one of the casinos (Red Rock, maybe?). At any rate, I ordered pancakes. There were stack size choices and I went with 5, announcing that you don’t want to run out of pancakes. They were excellent and large, I think I got through about one and a half. Even as large as they were, I’m pretty sure 20 or 30 yo me could have gotten them down.
The buns at Canadian hot dog stands are top and bottom halves but tend to be more substantial than some grocery store buns, although these have much improved over the last decade or two. The slit type as above, at least when I was a student in Montreal, were not much more substantial than a slice of bread, but still held everything in place.
I wonder what kind of buns Costcos in New England serve their hotdogs in…