The Swift Locomotive Works Throttle Quadrant is equipped with three control levers mounted on a single casting. The Throttle Quadrant is equipped with the Throttle Valve Lever, the Whistle Valve Lever (optional), and the Drifting Valve Lever (optional).

Throttle Quadrant picture showing Throttle Valave lever, Drifting Valve lever, Whistle Valve Lever
  • All metal parts are fabricated from Stainless Steel (except the Spring, which is Zinc plated Steel)
  • Five Lost Wax Casting in 316 Stainless Steel
  • 26 Precision laser cut parts
  • Fully functioning locking mechanism on the Throttle Valve Lever
  • 23 Locking positions on the Throttle Valve Lever
  • Fully functioning detents on the drifting valve lever
  • 4-40 Threads on the Whistle and Drifting Valve Clevises
  • 8-32 (Right Hand) Threads on the Throttle Shaft
  • Independent Mid Steel mounting plate for ease of welding to the boiler

The Throttle Quadrant can be customized depending on your requirements. All Throttle Quadrants come standard with the Throttle Valve Lever. The quadrant can be customized with the addition of the whistle valve lever and/or the drifting valve lever.

Base Throttle Quadrant ------------- $952.25

Add on the Whistle Valve Lever ---- $47.52

Add on the Drifting Valve Lever --- $214.27

Contact Info

  • E-Mail:

    SwiftLococmotiveWorks at gmail dot com

  • Mailing Address:

    1501 Kestrel Ct
    Norman, OK.

  • Phone:

    (405) 990-1323


Below is a video of the Throttle Quadrant and the two optional add-on levers

Click the lower right corner of the video to expand it to full screen