TCS CN, N Scale Motor Decoder:
The CN is a N-scale drop-in decoder for older Atlas, Kato, and Intermountain locomotives. Examples include the following:
 
Atlas:
GP7/GP9 Old Style
GP30/GP35 Old Style
SD35/SD50/SD60/SD60M
B30-7/B40-8
GP38
GP40 DCC-Ready
SD9 DCC-Ready
 
Kato:
C30-7
U30C
 
Intermountain:
SD40T-2
 
See the Installations Page for a full list of compatible engines!
 
Want to learn more about "Classic N" decoders from TCS? 
 
Back EMF Load Compensation: Provides superior slow speed control and high performance under load.
Quiet Drive: Super-quiet motor control for "buzz" free motor performance.
DC Mode: Decoder will automatically detect DC power. You can also configure how your lighting effects function on DC.
Variable Momentum: Allows you to make custom acceleration and deceleration curves.
Function Remapping: Buttons 0 through 12 may be used to control the lighting functions of this decoder.
Programmable Lighting Effects: Choose from 20 separate user-programmable lighting effects!
Dimmable Brightness: Configure multiple different brightness levels for your LED's or incandescent bulbs.
Decoder Lock: Feature which prevents accidental/unwanted programming while activated.
Airwire™ Compatible: Fully compatible with Airwire™ operation.
User-Loadable Speed Tables: Configure custom speed curves and set speed limits.
 
MSRP is $29.95. (Picture courtesy of TCS.)