Mack AC "Bulldog" haulers are legendary workhorses. During their 20-plus years of production (1916-1939), they were employed in many heavy industries including logging, petroleum, construction, and nearly anywhere a rock-solid chassis cab was needed. They were available with up to a 7.5-ton load capacity. The U.S. military made extensive use of the AC during WWI. Many of them remained in the countries where they served and were put to use by civilians for decades afterward.
The split-window C-cab pictured here served duty on the home front, for Texaco. The star-T logo can be clearly seen on the front grille. The dual-chain-drive is also visible in the photographs. Judging by the headlights and brake boosters, this is a late model. Yes, that's a crank at the front of the engine just below the mangled license plate, which was originally issued in 1951. A four-cylinder diesel powered this monster rig, but it wasn't at all about quickness, as top speed was in the neighborhood of 30 mph.
This derelict was captured on film in September 1966 by Bud Bryan, an editor at Rod & Custom magazine, as he was heading to another assignment. Its relative completeness indicates that this particular AC saw extensive service for decades after its production year.