PTC Model 5 — Coming Summer 2026
The next-generation successor to the PTC Model 4 programmable turntable controller.
After many years of dependable service, the motor used in the PTC Model 4 is no longer manufactured.
PTC Model 5 is being been developed as the natural evolution of the NYRS turntable indexing system — incorporating updated drive technology while preserving the accuracy, reliability, and sensor-free operation that PTC users expect.
- Close loop system stepper-absolute encoder
- Faster/Easier Programming, Editing – Add/Remove/Edit track positions at any time.
- LCD Touchscreen
- DCC control coming later
- Multiple motor sizes for different scales
- More info coming soon.
Thank you for your interest in the most advanced, reliable, and realistic turntable indexing system available today: the PTC Model 4 Programmable Turntable Indexing System from NYRS – New York Railway Supply.
Our indexing system is used all over the world with many very happy customers.
We’ve tried to include most of the essentials about the PTC Model 4 for your review. As always, feel welcome to contact us by phone or email with any comments or questions you may have about our system. Your feedback is appreciated.
Please visit the PTC4 page and the APR2 page for more details. Also visit the Gallery page to see customer craftmanship.
The PTC Model 4 (Programmable Turntable Controller) is a user programmable turntable indexing system for use in new or existing N, HO, S, O, and some G scale turntables. The turntable’s indexing positions are programmed into the PTC by the user, who “teaches” the PTC where the lead and service track positions are. The PTC does not use infrared diodes, tab stops, or any mechanical methods for indexing. Once programmed, the PTC remembers the user’s track locations– even when the system power is turned off. During operation, the user selects the desired lead or service track from the control panel. The PTC then automatically determines the shortest direction of travel, simulates turntable momentum by ramping up the bridge to a user-determined maximum speed, then ramps it down as it approaches the desired service or lead track location. The PTC then stops the bridge at the exact location desired, within 0.025 degrees.
The basic PTC is comprised of the Track Selector Module, Stepper Motor, Motor Mount Kit (optional), and Power Supply.
The PTC Model 4 is designed for users wanting to solve the problem of reliable turntable indexing. Situations where the PTC Model 4 will be of benefit include:
- Turntables with many lead and service tracks
- Turntables where the tracks are hard to see, particularly those in corners or near the rear of the layout, or those with dim lighting.
- Layouts with high quality, highly detailed rolling stock and bridge modeling where "hands off" indexing is preferred.
- Any situation where reliable, accurate indexing will enhance layout operation and enjoyment.
