RT @NGVJournal: United States: Pittsburgh operator trials #C aspwv2013-10-21T00:00:00-04:00October 21st, 2013|Twitter| RT @NGVJournal: United States: Pittsburgh operator trials #CNG tractor from @MackTrucksInc http://t.co/8GsJ8b4IIr Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail