Typical Chassis

DMF RW-1630 railgear is designed for vehicles with GVWR’s 33,000 lbs. and above, such as:

  • International 7600
  • Freightliner 114SD
  • Sterling LT series
  • Mack Granite

For greater capacities, you can upgrade to our RW-1650 rear gear. It can boost your hi-railing weight capacity by supplying a larger axle, bigger bearings, and special hardened rail wheels.


Optional Features

  • Rail Wheel Brakes
  • Insulated Wheels
  • Rail Sweeps
  • Remote Pin-Offs
  • Non-Standard Track Gauges
  • Slotted Links


DMF’s RW-1630 railgear is our original and very successful hi-rail gear for large trucks. The front guide wheel assembly attaches to the frame and front axle and lifts the front wheels off the track, thus, utilizing the vehicle’s front suspension. This design supports the vehicle as it was intended and helps the truck navigate curves smoothly and dampen out the effects of track irregularities. The rear assembly attaches directly to the truck frame behind the rear axle/tandem spring hangers. It deploys with an articulated dual-scissor action that allows the rear railgear to be moved both vertically and horizontally. This mechanism provides the “side-shift” action which has made DMF gear so well-known in the industry. It gives operators a greater margin for aligning the vehicle to the track which speeds and simplifies the process of getting the vehicle on rail.

Additional Details

Materials:  All structural members and brackets are constructed of carbon steel. The 16″ guide wheels for DMF RW-1630 railgear are machined from hardened steel castings and are fitted to high-strength alloy steel axles with heavy-duty tapered roller bearings.
Installation: Both DMF front and rear guide wheel units bolt to the truck frame using only hand tools found in any shop. They are designed to minimize the amount of space required and in many cases fit within the existing boundaries of the vehicle. The front units, however, sometimes require a bolt-on frame extension to complete the installation. Rear RW-1630 railgear mounts below the top of frame and directly behind the chassis spring hangers.
Brakes: The optional RW-1630 rail brakes are of the air-actuated external Cobra shoe type. The rail brakes use a truck-style air chamber to supply the clamping force. Supply pressure comes from the vehicle’s air system. A pressure protection valve separates the railgear and the truck’s air systems, preventing a failure in the rail brake system from adversely affecting truck braking. The rail brakes are applied simultaneously with the truck brakes when the operator presses the brake pedal assisting the existing vehicle brakes when in rail mode. There is also a dashboard-mounted switch that permits the operator to enable or disable the rail braking system.
Operation: The truck is pulled onto a crossing and the wheels aligned to the tracks with attention being paid to the front. The operator then activates the hydraulic power unit pulling the lever of the hydraulic valve to raise the railgear off of the pin-off device. The safety pins are removed and the lever pushed forward lowering the rail wheels to the track. The front gear will lift the front of the truck and go over-center. The rear is operated similarly. The gear is raised to lift the weight from the pin-offs and the pins are removed. The gear is then lowered via the two-handled valve at the rear of the truck. Each spool may be operated independently to articulate the rear gear and engage the rail even if the rear wheels are not perfectly aligned. Once the rear gear is fully deployed, the pin-offs are re-inserted to lock the gear in place.
Steering Wheel Lock: The steering stop is provided with the optional rail wheel brake assembly. If the unit is not equipped with optional brakes, a steering wheel lock is provided, requiring no modifications to the column.



  • Standard: Attached to front vehicle springs.


  • Standard: Installation is to vehicle frame (bolted and clamped) below the top-of-frame line and directly behind the rear axle/tandem spring hangers.


  • Air external shoe, actuated by vehicle brake pedal operation to assist the existing vehicle brakes when in rail mode.


  • RW-1630: 40,000 lbs. per guide wheel axle at 20 MPH.
  • RW-1650: 70,000 lbs. per guide wheel axle at 20 MPH.


  • Front: 1,385 lbs.
  • Rear: 1,185 lbs.


  • Front uses front vehicle suspension.
  • Rear acts as a rigid member between the rail and frame.


  • 56-1/2″ standard.
  • Alternate gauges available.


  • Large 3-1/4″ 100,000 psi yield axle with 2-7/8″ spindle.
  • Two cast steel 16″ wheels per axle with two Timken roller bearings per wheel.


  • Front – Rail Mode: Design is overcenter so support is through design and welded stops.
  • Front – Highway Mode: Mechanical safety pin-offs with optional remote feature.
  • Rear: Mechanical safety pin-offs are provided for rail and highway positions. Remote cable or air operated pin-offs are optional.


  • Typical requirements: 5 gpm @ 2,000 psi.
  • Pressure source: PTO/pump.
  • Valves: Control valves are located at each assembly.
  • Hose and fittings: SAE 100 R1, JIC swivel ends.
  • Cylinders: Manufactured by DMF.
  • Manual control valves raise and lower wheels and are located near assemblies to allow visual inspection during operation.