This is a great example of the Western Star 4800 SB model truck rigged with rail gear and vacuum equipment. This unit travels the railway tracks in the New York City area and cleans the track ballast.
If you’ve never heard of the ballast, it’s the rock, or track bed, upon which the rail ties are laid. Having this Western Star keep it clean is very important since that ballast bears load of the railroad ties, facilitates the drainage of water, and also keeps down vegetation that could potentially interfere with the track.
Now back to the Western Star at hand! This bumblebee chassis starts with a Detroit DD13 engine with 410 HP. It’s wrenching an Allison 4500 transmission, turning a set of 45K Meritor axles, floating on 20K front and 46K walking beam suspension, spread out on DC rails over a 275″ wheelbase.