RollBy™ OnBoard Speedometers
For Android SmartPhones & Tablets
For Apple iPhones & iPads
(Available in the US & Canada only)
Ever wonder how fast your train is really going… in that tunnel?
Or how long your Main Line is from one end to the other?
What about the mileage from Union Station to Burns Junction?
Do you ever wish you could keep an eye on all the speed-demon engineers on your layout — in a single glance?
The RollBy™ OnBoard Speedometer turns your SmartPhone or Tablet into a dashboard speedometer for your trains — and it accurately measures distances on your layout too!
The OnBoard Speedometer installs easily in any railcar on your layout and sends speed and distance data to the free RollBy™ Train Speedometer App on your mobile device while the car's moving.
This video demonstrates the RollBy™ OnBoard Speedometer and the RollBy™ Train Speedometer App — including how to download the App from the Google Play Store or the App Store to check your SmartPhone's compatibility.
Train Speed & Distance Sensor for Smartphones & Tablets
- Transmits speed and distance to your Android Smartphone/Tablet or Apple iPhone/iPad
- Display with free RollBy™ Train Speedometer App
- Continuous speed (3 MPH – 200 MPH) and distance from any railcar
- Perfect for measuring distances on your layout
- App tracks more than one OnBoard Speedometer simultaneously
- Requires Android 4.3 or iOS 9.0 or greater with Bluetooth Low Energy
Simple installation
- Circuit board fits standard gauge cars in N Scale, all cars in HO and larger scales
- Connect button cell battery (included) with circuit board jumper
- Replace existing railcar wheelset with Rotation Wheelset (included)
Included parts:
- RollBy™ OnBoard Speedometer Circuit Board, battery included
- Rotation Wheelset with cylinder magnet
- Stainless steel screw (HO Scale only)
- Product Manual
BEFORE YOU ORDER…
Be sure your SmartPhone is Bluetooth Low Energy (BLE) ready BEFORE you order your RollBy™ OnBoard Speedometer!
- Download and install the RollBy™ Train Speedometer App from the Play Store or App Store.
- Run the App to check your device software and its BLE compatibility.
- Upgrade your mobile device software if necessary.
- The App Welcome Page will display when your device is BLE ready — now you can order your Onboard Speedometer with confidence!
Please confirm before ordering:
I have successfully installed and run RollBy™ Train Speedometer App on my mobile device.
OnBoard Speedometer — HO Scale 33" Wheels
Limited stock. Please contact us to order.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for HO and Larger Scales
- HO Scale 33" standard gauge Rotation Wheelset (built from Intermountain Railway Co. all-brass insulated wheelset)
- Stainless steel screw
OnBoard Speedometer — HO Scale 36" Wheels
Limited stock. Please contact us to order.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for HO and Larger Scales
- HO Scale 36" standard gauge Rotation Wheelset (built from Intermountain Railway Co. all-brass insulated wheelset)
- Stainless steel screw
OnBoard Speedometer — N Scale 33" Wheels
Out of stock.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for N Scale
- N Scale 33" standard gauge Rotation Wheelset (built from the recently-released Intermountain Railway Co. High Detail Brass Insulated Wheelset)
OnBoard Speedometer — N Scale 33" Micro-Trains® Wheels
Out of stock.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for N Scale
- N Scale 33" standard gauge Rotation Wheelset for Micro-Trains® (built from Intermountain Railway Co. High Detail Brass Insulated Wheelset to fit Micro-Trains® Trucks)
OnBoard Speedometer — O Scale 33" Wheels
Out of Stock.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for HO and Larger Scales
- O Scale 33" standard gauge Rotation Wheelset (built from an Intermountain Railway Co./Atlas O all-brass insulated wheelset)
OnBoard Speedometer — Large Scale 31mm Wheels
Out of Stock.
- Includes:
- RollBy™ OnBoard Speedometer Circuit Board for HO and Larger Scales
- G Scale 31mm Rotation Wheelset (built from a Bachmann 31mm diameter / 45mm gauge insulated wheelset)
Customer Comments
"Rollby Speedometer is a great tool for measuring real and scale distances for layout planning and construction, as well as monitoring scale speeds during an operating session.
"As a modern modeller, it's like monitoring the train using GPS!"
— John Parker, Fall River Division, BNSF Ry
"The Rollby Speedometer is a fun and useful adjunct to model railroad operations. It has helped me with operations planning through it's time recorder, and the speedometer will help keep throttle-frisky operators to the listed maximums. Enjoy!"
— David Stewart, Appalachian & Ohio Railroad
"My RollBy Train Speedometer arrived today — this is GREAT!! The geek side of me as well as a model railroader thinks this is the greatest thing since sliced bread.
"I have tried to do something on my own, copying something that was in a magazine many years ago — it worked, but it was a clunky process, and the accuracy was in question. This is so simple."
— Bob Ullrich, Baltimore & Ohio RR
"I am building a large outdoor railroad in G gauge with a track plan designed for operations. I use the accurate odometer information to measure the distances on the railroad. RollBy will provide instant feedback to operators not familiar with large scale train proportions and the different feel for speeds from the smaller scales.
"This is a truly innovative product that will be useful in many aspects of my railroad's construction and operation."
— Gene Fusco, Northfield Subdivision, Penn Central
How to Install
The Rotation Wheelset must rotate freely. Carve away interfering details like this N Scale center sill.
Snap the Rotation Wheelset in place. Check for free rotation. Wheelset magnet will accumulate magnetic debris that will jam the axle — clean with sticky tape.
Magnetic materials will "grab" the Rotation Wheelset. Replace weight with brass or lead. Use brass, plastic, or stainless steel for nearby screws. (HO Scale OnBoard Speedometers include a stainless steel screw.)
Simlarly, magnetic material along the track, such as track nails, will cause the wheelset to grab and the railcar to buck.
Tape or glue the OnBoard Speedometer circuit board in place with its white end above Rotation Wheelset.
Connect the battery with the circuit board jumper — the LED will flash and your OnBoard Speedometer is ready for action.
Large Scale (G) Installation
Large Scale Wheelset installed in a G Scale boxcar truck.
No modification necessary. No weight or screws replaced.
The OnBoard Speedometer circuit board taped in place with its white end above Rotation Wheelset.
It will be pretty lonely inside the boxcar shell!