Taking advantage of the increasing popularity of natural gas, particularly in the refuse market, Mack's newest version of the TerraPro cabover model aims at both garbage-hauling and construction applications. It's available now, sporting the 9-litre Cummins Westport ISL G rated at 320 hp and able to use compressed (CNG) or liquefied natural gas (LNG). Its three-way catalyst meets EPA 2010 emissions standards. 

The ISL G engine is not installed as an aftermarket conversion, rather on the production line at the Mack assembly plant in Macungie, Pa. Thus it comes with factory support and warranty.

Republic Services, a major player in solid waste collection, transfer, recycling and disposal services, has recently taken delivery of 41 of these natural gas TerraPro models. 

Mack is no stranger to natural gas vehicles. In fact, back in the early 1990s the company participated in a demonstration project in which Mack MR models powered by a natural gas version of the company’s E7 engine were put into service at a local landfill, using an on-site natural gas refueling system.