The 4900 SA is available in a 123" BBC for this specialized 6x4 railway maintenance application -- that travels on both road and tracks. A classic hood is standard on the 4900SA, with a high-visibility hood option.

Specifications
BBC	123"
Axle Position	50"
Engine	3 manufacturers, 210-600 HP
Transmissions	Full range of manual, automated, and automatics
Front Axle Range	Up to 20,000 lbs.
Rear Axle Range	Up to 58,000 lbs.
GCW	Approx. 1,700,000