Oggy for a pasty is certainly South-west English, witness Cyril Tawney's song. Not (that I ever recall) North-eastern, although clearly the term could have appeared around the Tyne and Wear docks so I can't rule it out completely.

One point that perhaps needs expanding on is the renowned working capability of the navvies. In the 19th Century this was certainly well-known, hence the phrase "working like a navvy" touched on above. I believe some teams were also taken abroad to build French (at least) railways because of this. Presumably this was partly due to good organisation, but sheer effort clearly counted.