Hidden Boston reviews Simco's in Mattapan:

... Simco's is a true slice of Americana; the young and old alike come here day in and day out, trying to grab the parking spots out front or over by the adjacent railroad bridge, while on Sundays, neighborhood folks pour out of the church across the street in their Sunday best, ignoring the potential for chili- or cheese-related disasters that can (and will) develop while eating Simco's dogs. And on warm summer nights, diners can be seen sitting on stoops or along the bridge, enjoying some of the best hot dogs Boston has to offer. ...