Side-mount CNG fuel systems

Our ProRail® side-mount CNG fuel systems are engineered for high performance, safety, durability, and can be installed on both sides of the frame rail.

Improved performance

Our systems have fuel capacity options from 17-60 DGE and enable up to 13% faster fill up compared to other CNG fuel systems. Our Marathon™ regulator delivers improved low-pressure performance and extended range.


Can be combined with ProCab® behind-the-cab fuel systems for additional capacity and range. Automotive-grade exterior paint can match any fleet’s custom color.


The system is one-million-mile simulated durability tested, and the new improved design builds on ProRail's nearly 10 years of real-world experience.

Lightweight and safe

When weight matters, our lightweight Type 4 cylinders enable trucks to haul more freight. Our ProRail CNG fuel system is developed and tested to exceed industry safety requirements for crash and fire testing, including a patented bumper bar for built-in side impact crash protection.


interchangeable with CNG

1 million

mile durability tested


faster to fill up

Download specifications

Our ProRail® CNG fuel systems offer adjustable Drop & Go brackets for easy and flexible installation.
Day cab ProRail® CNG fuel systems are one of our most popular applications.
The wide range of capacities allows ProRail® CNG fuel systems to be installed on most any chassis.
Our ProRail® CNG fuel systems are a great choice for extreme-duty truck fleets.
ProRail® CNG fuel system.
Combining our ProRail® and ProCab® CNG fuel systems gives your fleet extended range.
Day cab ProRail® CNG fuel systems are one of our most popular applications.