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Nathan AirChime K3 540 Train Horn Kit

(Fastest Filling to Continue Honking!)


6 reviews

Suggested Addons
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1 year add-on to existing warranty. Does NOT cover accidental damage, no advanced replacement.
Click here for more information!
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Add Platinum Extended Warranty Tooltip
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Looking for an authentic train horn? How about the same horn that is used on many locomotives still today?  With our Nathan AirChime K3 540 train horn kit, you get the real deal: an actual train horn pulled straight from a retired locomotive powered by one of our fastest premium onboard air systems! These die-cast horns are not for the faint of heart. If you are wanting the same majestic train horn sound you hear when you are stopped at the railroad tracks, this is the kit for you!

Our Nathan AirChime K3 540 train horn kit features the classic Nathan Airchime K3 train horns: A 3-chime die-cast horn that was built to withstand anything Mother Nature can throw at it and sound great doing it. Tried and tested for decades, you won't find a more dependable horn or a more recognizable train horn sound. Oh, and did we mention they are one of the loudest horns you can buy? With a smaller profile than its 5-chime big brother, the K3 is the horn of choice for many show trucks and daily drivers alike.

With a beast of a horn this size, you just can’t settle for a mediocre air system. With our Nathan AirChime K3 540 train horn kit, you get one of our fastest-filling premium onboard air systems. Our black 5-gallon 8-port air tank provides enough air to blast your K3 Train Horns for an entire 5-seconds continuous seconds, ensuring that you get your point across. The Viair 400C that powers the system is one of the fastest-filling compressors we carry, able to recharge our 5-gallon tank from 110-150 PSI in a stunning one minute and 40 seconds! Like all of our train horn kits, the Nathan AirChime K3 540 train horn kit comes complete and includes all required hardware and instructions.

  • Railroad-use train horn!
  • Heavy-duty 400C air compressor
  • Extra-large 5-gallon air tank
  • Max honk time: 5-7 seconds

***All Nathan Airchime Horns have a 7-10 Business Day Lead Time!!***

  • Part Number: HK-K3-540
  • Operating Pressure: 150 PSI
  • Restart Pressure: 110 PSI
  • Voltage: 12-Volt DC
  • Horn: Nathan AirChime K3
  • Horn Length: 18.25″ (463.55 mm)
  • Horn Width: 16.25″ (412.75 mm)
  • Horn Height: 9.75″ (247.65 mm)
  • Horn Weight: 32 lb (14.51 Kg) 
  • Horn Air Inlet: ½″ Female NPT
  • Tank: HornAir 5-gallon air tank
  • Tank Length: 20.5″ (520.7 mm)
  • Tank Diameter: 9.5″ (241.3 mm)
  • Tank Height: 11.5″ (292.1 mm) (With Legs)
  • Tank Weight: 20 lb (9.07 Kg)
  • Tank Ports: x7 1/2", x1 3/4"
  • Air Compressor: Viair 400C air compressor
  • Average Fill Time: 1 Min 30 Sec
  • Voltage: 12 volts DC
  • Air Flow: 2.54 CFM at Free Flow
  • Max Amperage: 26 amps
  • Maximum Duty Cycle: 33% @ 100 PSI
  • Compressor Length: 9.0″ (228.6 mm)
  • Compressor Width: 4.0″ (101.6 mm)
  • Compressor Height: 7.05″ (179.07 mm)
  • Compressor Weight: 8.00 lb (3.63 Kg)

5-Gallon Air Tank Dimensional Drawing

0 2.62 16 0 74.0 16
10 2.39 18 1.0 65.0 20
20 2.21 20 2.0 60.0 23
30 2.11 22 3.0 56.0 25
40 2.01 24 4.0 53.0 27
50 1.93 25 5.0 49.0 28
60 1.84 26 6.0 46.0 28
70 1.73 27 7.0 42.0 28
80 1.65 27 8.0 38.0 28
90 1.52 27 9.0 35.0 27
100 1.45 27 10.0 31.0 27
110 1.35 27
120 1.26 27
130 1.19 27
140 1.08 27
150 1.01 26

* Supply Voltage: 13.8 Volts

0 to 105 PSI 2 min. 55 sec. (± 10 sec.)
85 to 105 PSI 45 sec. (± 05 sec.)
0 to 145 PSI 4 min. 50 sec. (± 10 sec.)
110 to 145 PSI 1 min. 40 sec. (± 05 sec.)

* Supply Voltage: 13.8 Volts

  • Money-Back Guarantee/Refund Policy
    All merchandise unless otherwise indicated may be returned within 30 days from the shipment arrival date for a refund. A Returned Merchandise Authorization (RMA) number is required for all returns. A 15% restocking fee may apply. Additional deductions may be made to reflect the products current market value. These terms apply to all refunds. Most products are shipped with a refund/replacement guarantee period unless otherwise noted in the product listing. Customers must inform of any order discrepancy within 7 days from the invoice date so that we may investigate and resolve the situation accordingly.
  • Warranty
    This product is backed by our One-Year Manufacturer's Defect Warranty!
  • Satisfaction Guarantee offers our customers a 30-day satisfaction replacement or refund guarantee on all purchases, except when otherwise noted in the product listing.
  • Cross-Shipments will not cross-ship returned merchandise.
  • Physical Damage Policy
    Physical damage to any product purchased at will effectively void warranty coverage. Physical damage includes but is not limited to improper handling and/or any other type of damage sustained by irregular usage.

Warnings & Notices

Hearing Loss warning icon
Hearing Protection Required

This product produces extreme loudness. Proper hearing protection must be worn at all times during its operation. Hearing loss or permanent damage may result from unsafe use. Use this product in a safe and responsible manner and at a distance of at least 100 meters from others. Never operate this product in a closed environment, in close proximity to living beings, or where prohibited by law.

Safety warning icon

This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

Customer Reviews

4.8 Based on 6 Reviews
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Filter Reviews:
Donald T.
United States United States

Gets all the commies outta my way.

This thing right here will get all the Commies and Libtards outta your way in the press of a button!!

Kenny B.
United States United States

Super loud!

This thing makes me look forward to people cutting me off!!

Barry M.
United States United States

This thing is the real deal!

So in love with this horn. Most definitely the best addition to my truck. Nothing like having a real piece of locomotive history that'll get anyone outta your way!!

Darrell R.
United States United States


THIS THING IS INSANELY LOUD! After a few hours of installing it I had to give it a few honks to test it out. Unfortunately for my wife, she had just got home from shopping. So, of course, I had to get her with it! Within seconds of honking it she not only jumped a mile high but instantly started threatening to divorce me HAHA! If I would have known it was that easy I would have bought one of these forever ago!

Brantley M.
United States United States


Now I love when people have the balls to cut me off or swerve in my lane! If it doesn't make them s*** their pants it will for sure make sure they know I am there! After a few hours of installing it, I was off and honking like a runaway train!