in philly, you'd order that as a steak sandwich witout chees, wit hot peppers. you'd better not ask for jus.
the original sammy sounds good. i've never heard of italian beef, per se. with the exception of roast beef that is marinated in italian herbs and spices, but not as a specific sandwich with jus and hot peppers. i will have to ask around.
you've reminded me of a defunct shop by my job.
on the west side of manhattan, there used to be a famous sandwich shop (rocco's on 10th and 56th) that made something called a "giacomo": roast beef and onions were quickly browned in olive oil on a griddle, then brown gravy was poured over top, then a few slices of cheese. an 8" hero roll was placed on top to kinda steam with the other ingredients, then it was spatula'd up in one motion into the bread, then tightly wrapped so the gravy and cheese doesn't escape.
oh man, i need roast beef! now!