This device is a great way to adjust train speed when running multiple trains on the same loop. Since locomotives run at different speeds, it can be challenging to get them spaced and running without collision. I got one of these and it did the trick. See the video...
Connects to power through USB cable. (Not included)
SPC100R
The SPC100R is a Speedometer. SPC100R can measure Z/N/HO/OO/TT/O gauge driving speed.
It is divided into four regions, the United States, the United Kingdom, Europe, and Japan. Each region has a corresponding specification menu.
The single lap timing function can measure the time to complete a lap and can be used to adjust the speed of the vehicle.
The speed unit can be switched between kilometers and miles. The speed is automatically displayed after the vehicle passes.