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T5 · five-chime air horn

Five chimes. Printed solid. Built by hand.

A five-chime train horn made to order in Lake Worth, Florida, and blown on air before it leaves.

Render of the finished T5 in black PETG, the same viewLine drawing of the T5 air horn, high mount, from the front left
T5, high mount. Left: the design drawing. Right: a render of the finished horn. Drag to compare.

What the Depot makes.

A built T5 on the floor with a red air line connected to its foot
A real T5, on air in the shop.

Hear a real one.

Two real recordings of a built T5. Turn your volume down first, then up. They were filmed on a phone, and phone microphones clip at this volume, so it sounds different in person. Read the Safety notice before you run one yourself.

Up close, outdoors
Heard from down the road

Pick your chord.

Compare all five
Front view line drawing of the T5 in the high mount
High mount, from the front
Front view line drawing of the T5 in the low mount
Low mount, from the front

The spec sheet.

Measured from the design and the finished horn. No invented decibel numbers or pressure ratings: if it has not been measured, it is not on this page.

BellsFive, each with its own diaphragm and rear cap
MaterialPETG, printed solid: eight walls and every layer filled. Gaskets and nozzle sleeves in TPU.
Size, high mount15.8 × 20.6 × 12.8 in. The two long bells hang 3.0 in below the foot.
Size, low mount21.5 × 20.6 × 10.0 in. Nothing below the foot.
WeightAbout 11.5 lb (5.2 kg) assembled
Air inlet1/2 in NPT, in the centre of the foot, underneath
MountingFour 1/2-13 bolts with SAE flat washers and nylock nuts (no lock washers), on a 3.00 in circle, foot 4.00 in across
PressureNo rating is published. Set the pressure switch below your lowest-rated part and follow the first-run steps in the manual.

From order to horn.

  1. 01OrderedYou pick the chimes and the mount. Your private order page opens and the deposit starts the build.
  2. 02PrintingEvery bell is printed solid, eight walls and no hollow infill, one part at a time. The thick walls carry the sound.
  3. 03AssemblyBells, manifold, wings and the five rear stacks are fitted, sealed and bolted by hand.
  4. 04Sound testThe horn is blown on air before it leaves. Your order page moves to each stage as it happens.
  5. 05ReadyPick it up in Lake Worth, or have it shipped with the printed manual and its build record.
PDF · 17 pagesDownload the manualMounting, air supply, wiring, first run, care and servicing, with an actual-size template for the mounting plate.

Install it right.

Every horn ships with the printed manual. Read it before you buy if you like, and plan the air system with the install guide.

Made to be repaired.

All spare parts

Bells, gaskets, diaphragms, caps, manifolds and wings are all sold on their own, so a horn can be fixed or grown.

Questions.

All questions
What is the T-Series?

The T-Series is The Unordinary Depot's multi-chime air horn. It is printed in black PETG, finished by hand, assembled and tested. You choose how many chimes you want, from one to five.

How do I choose a version?

More chimes make a richer, deeper chord. The 5 chime is the full horn. The smaller versions leave ports empty and close them with blocking plates, so you can add bells later.

What are high and low mount?

On the 4 and 5 chime, two mounting wings turn to change the layout. High mount stands the bells tall. Low mount spreads them wide and sits closer to the base. The product page lists the size of each.

What do I need to run it?

A source of compressed air with a pressure switch, a tank with a relief valve, a valve and the lines to connect them. Read the Safety notice first.