Fast Clock Master



The wired version of the fast clocks are no longer available.   This page has been kept only to preserve product documentation.  Please consider the PaceSetter Wireless Fast Clock and Wireless Remote Displays instead.

For those seeking more realistic model railroad operations, a fast clock - a clock that runs at some multiple of real time - is often the answer.  The distances on our layouts are never as far as on a 1:1 railroad, and to simulate realistic timetable operations, we need time to be scaled down to match our trains.  That's where the Iowa Scaled Engineering Fast Clock Master comes in - a fast clock targeting model railroad applications, with flexible configuration to accommodate most any layout or operational scenario, and that will automatically network with other displays placed around the layout.  Connected by standard Cat-5 cable, the secondary displays show the current time - either scale or real - so every operator can easily keep an eye on the time.

For those not wishing to install additional cable infrastructure around the layout, the Wireless Fast Clock Master and Wireless Secondary Displays are the answer.


  • Fast clock ratios selectable between 1.0:1 and 99.9:1 in 0.1 increments
  • 12 (am/pm) or 24 hour time display formats
  • Three configurable start times
  • "Hold" mode for when you need a "time out" in the middle of the operating session
  • Real time clock and calendar with battery backup
  • Automatically coordinates with any number of secondary displays
  • Connects to secondary displays with standard Cat-5 cable
  • Faceplate included


Screen display area: 3.00" (W) x 0.98" (L)

Screen area with bezel: 3.66" (W) x 1.57" (L)

Overall size: 4.00" (W) x 2.50" (L) x 1.25" (H)

Faceplate CAD drawing with detailed dimensions

The Fast Clock Master requires an 8-18V DC power supply, capable of an additional 3W for each master and secondary display being powered.  Example: 1x Fast Clock Master + 3x Secondary Displays = (1+3) * 3W = 12W minimum.


The complete gEDA design files are available on GitHub.

Product Brochure

User Manual


Advanced Use Cases

Note:  The following advanced use cases require the user to be familiar with embedded C programming.

As with most of our products, the MRB-FCM is open source hardware and software.  We provide all the design files, and you're more than welcome to build your own or tinker with the software.  Design files can be found at the GitHub link above.

Since the MRB-FCM broadcasts time status on MRBus, any node on the bus can be configured to act on the current clock status.  Potential applications include automating layout lighting to match scale time of day, control of model structure lighting, or even triggering station announcements or layout animations.  Alternatively, for users willing to write their own firmware, the MRB-FCM can be repurposed as a generic MRBus-enabled LCD panel with a real-time clock and buttons.   If anyone actually does this, please let us know and we'd be happy to feature your new application.

  • $100.00

Available Options

Related Products

Fast Clock Secondary Display

Fast Clock Secondary Display

The wired version of the fast clocks are no longer available.   This page has been kept ..


News & Application Notes

Interfacing With ISE’s Fast Clocks

The idea of a clock that runs faster than real time to compensate for the compression in our model world is nothing new.  The idea has been with us since at least the 1960s.  It provides a way to schedule our operating sessions, providing a sense of real time passage and urgency without needing literally thousands of feet of track to represent the vast distances covered by our prototype railroads.  Aside from being a display on the wall, guiding operators’ train movements, fast clocks have remained an isolated system, our model world unaffected by the passage of scale time.  Think about all the things in our daily lives that are linked to the time of day and you’ll quickly realize how odd that is given all our other technological advancements, and how much potential is in that idea.  I believe fast clock integration is one of the huge, unexplored areas left in the hobby today for added realism.

In this article, we’ll show you how to build an inexpensive device that allows you to synchronize items on your layout to fast clocks by using MRBus, the networking protocol that connects the Iowa Scaled Engineering Networked Fast Clocks, in conjunction with the popular Arduino prototyping environment.


Pausing Time: Using Fast Clock Hold Mode

Have you ever been in the middle of an operating session and disaster strikes?  A train derails, shorting out the DCC system, taking with it a power district, or even the entire layout. The problem is eventually fixed, but in the 5 minutes it took to restore things to the way they were, your fast clock kept ticking away. With a 3:1 ratio, all trains are now  suddenly 15 minutes late.

Wouldn’t it be nice to simply press a button on the fast clock to pause time, then with a single press, restart the time right where it left off?


Solar Car Teams

As alumni of the Iowa State University Solar Car Team, Team PrISUm, we recognized that many of Iowa Scaled Engineering’s products could be used by teams competing in solar racing competitions.  In fact, MRBus had its origins in the Sunrayce ’99 car, PrISUm Phoenix.


Interlocking In A Box

One of the new projects we are working on is an “Interlocking In A Box” – a simple, yet flexible piece of signal logic designed to control an automatic interlocking for a diamond on a model railroad.  The idea came from one of the mail lists I’m subscribed to and we have been working on refining the definition and designing the signal logic over the past several months.  I figured now would be a good time show everyone where we are headed and maybe get some feedback.


Iowa Scaled Engineering Fast Clocks

Looking to enhance your operations with a fast clock system?  Do you need multiple displays around the layout?  Do you want a configurable, yet easy to use system for your operators?  The Iowa Scaled Engineering Fast Clock system may be exactly what you need.



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