Welcome to QSI, AKA QS Industries

Electronics for Model Railroading
Since 1983
and still the best!

    New product is on hand, and available for immediate sale, direct from QSI.

  • Titan-U universal HO sound decoder. $129.95
  • Titan-DO sound decoder for 2-rail O scale. (same as used by Sunset Models.) Also works great for most G-scale equipment. $209.95
  • Quantum Engineer for DC powerpacks. $99.95
  • Quantum Programmer. $89.95
Please direct all questions and orders to our new email address.
We use Paypal as the preferred payment format.
Dealer inquiries welcome.

All QSI products include wire harness and 100% functional testing prior to shipment. In many cases, we can pre-program for you. Units damaged by installation errors are subject to a replacement fee. If you need support, drop us an email

Good news! the Yahoo message site has moved to io. Come see us at the new site
QSI IO Forum. We monitor this site daily.

The contact us tab works too.
Talk to us.
This site is now under construction. 12/01/19
© 2017, Q S Industries, Inc.