In an era of cutthroat competition and profit measured in pennies on the dollar, if a trucking company lasts ten years it’s worth celebrating. Only a handful of carriers operating today have ever logged 50 years in existence. Then there is Elizabeth, N.J.-based New England Motor Freight. NEMF, whose maroon colored trucks and trailers are ubiquitous in the Boston-New York-Washington “Acela Corridor,” hits the century mark this year as the company celebrates 100 years of operating during its year-long centennial celebration.