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The Arnold Company is the number one Railcar Gate Door Opener manufacturer in the United States. As home of the Door Demon® Railcar Hopper Gate Door Opener, we specialize in making custom designed Railcar Gate Door Openers to meet the specific needs of your working environment! We also carry a full line of Industrial Vibrators.

We take pride in our product selection, product quality, and personalized customer service! We offer our customers affordable, practical solutions to their Railcar Gate Door Opener needs and stand behind our products!

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Check out the why your Rail Car Gate Door Opener should come from us!




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Arnold Company Door Opener Products are proudly produced in the U.S.A.






The Arnold Company is a BBB Accredited Business. Click for the BBB Business Review of this Machinery - Specially Designed in Trenton IL

Hopper Gate Door Openers

The 2-Wheel Door Demon: DC


With no external power supply, the DC Door Demon could be the most exciting door opener today. Two large batteries allow the DC Door Demon to move anywhere in an instant. You can quickly adjust the height to your doors and go to work, and with its NEW hydraulic adjustable vertical lift, it is even easier and safer to operate.



The 2-Wheel Door Demon: Pneumatic


The Pneumatic 2-Wheel Door Demon is the first railcar gate door opener built from the ground up to meet the new standards set forth by AAR S-233-92 for the new larger car doors. This railcar gate door opener is not converted from something else.



Demon Stick Manual Opener


The Demon Stick is our basic low-cost opener which can be carried or mounted to on a two-wheel cart. Sold with or without the cart-standard 4 foot length and tip with optional 3-foot extension bar. Reversible ratchet drive for easy direction change and adjustable pivot mounting for most capstan levels.



The Beam Mounted Door Demon: Pneumatic

The Modular Door Demon is designed to open railcar hopper doors without danger of physical stress to the operator. This custom-made pneumatic operated railcar door opener mounts on a 6" x 6" I beam to roll smoothly on its hardened rollers.


The 2-Wheel Door Demon with Sideshift Wheels

The NEW 2-Wheel Pivot Door Demon hopper gate railcar door opener has all the quality and safety features you expect from all of the products built by The Arnold Company.


The Conveyor Mount Door Demon

The Arnold Company has solved yet another application issue with the conveyor-mounted Demon. Being the only company that concentrates solely on gate openers allows for maximum customer interface and problem solving.


The 3-Wheel Door Demon ("Spider")

Having three wheels makes the 3-Wheel Door Demon highly maneuverable and adjustable. A special hydraulic arm allows for vertical adjustment to match most door capstan positions.


The Fork Mount Door Demon

The "Fork Mount Door Demon" is designed to open railcar doors without the danger of physical stress to the operator.



The Beam Mounted Door Demon

This traversing beam-mounted unit has power height adjustment, as well as forward and retract motion on the drive tip to provide 3 axis of mobility.



The Skid Steer Mount Door Demon

The quick attach mounting of the Skid Steer Door Demon fits most units while also providing the flexibility of multiple positions.



The Sanitary Shield Door Demon


This unique set-up from The Arnold Company uses a configuration of the DC Demon with a special head attachment.
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