RollBy Train Speedometer

9 reviews
Content rating
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About this app

RollBy Train Speedometer is a free (and ad-free) speedometer and odometer for model trains on your Android phone or tablet. Requires a RollBy OnBoard Speedometer for each train, available from Boulder Creek Engineering (

Now you can see how fast your model train is traveling and how far it has gone. Measure the distance between towns, or the length of your sidings and yard tracks.

• Receives speed and distance with Bluetooth Low Energy (BLE) radio
• Continuously measures speed and distance while train is in motion
• Tracks more than one RollBy OnBoard Speedometer at the same time
• Measures Real and Scale Distance on your layout
• Displays elapsed Running Time
• Speed and Distance displayed in English (MPH, feet, miles) or Metric (KPH, meters, km)
• Requires Android version 4.3 or greater with BLE capability
Updated on
Apr 23, 2020

Data safety

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9 reviews
Raymond Newnes
October 5, 2021
Doesn't work very well. Not accurate, not even close.
1 person found this review helpful
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Andy Zimmerman -Senior Chief
February 4, 2022
You GOTTA have one of these! Love this app and the product
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A Google user
January 17, 2017
Great for watching train speeds and measuring distances on the layout.
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What's new

Release 2.1.1 updates the original release to be compatible with Android 9 (Pie) and beyond. There are no functional or feature changes.