Here is a view of the cab section of one of ONR's new Mack hi-rail boom trucks. Here you can see where the front flange wheels are mounted, the heavyweight front end, and the front frame extension the bumper is mounted on. This truck also has what looks like a "mini sleeper" attachment behind the cab for extra equipment storage. The rack across the top is for carrying sections of rail. Truck 772 was on a weekend layover in Englehart June 2010.
See these machines' first arrival on ONR property here.