Roast Beef Sandwiches are a Massachusetts item, but not just on the north shore.
Lordi's on Rt.62 in Burlington,MA has an enormous Super Beef on an onion roll for a little over $4-had to eat it with a fork.
Mikey's on rt3A in Billerica,MA has great roast beef,and flaky, crumbly onion rings-yummy.
Beefmaster, also on Rt3A in Billerica is just as good.
Both places also offer Chicken Kabobs over Greek Salads, souvlaki, and fried seafoods.
The common denominator for many of these places is either Greek or Mediterranean family ownership. You often see many generations of the same family working side by side.
Other names droppings:
Redneck's in Allston,MA
the new Buzzy's Roast Beef in Central SQ. Cambridge,MA-owner bought the name-different from the original.
the Bill and Bob's chain-remnants all over-my local one in on the Woburn/Winchester,MA line-good late night eats.
Riley's are still around in places, I hear Framingham,MA may still have one.
it should be noted that Kelly's has 4 locations-Saugus, Revere, Framingham, and Danvers