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It costs me a couple hundred each year to keep this site on the Internet.

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..................--- SpeedTrap Speedometer Menu ---

...............--- Straight Version & Curved Version ---

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I've started to speed match my locos to the 128 speed steps on the throttles I use. Speed step 10 = 10 mph, 45 = 45 mph and so on up to speed step 65 which is 65 mph. For most all of my locos that will be the top speed. For some locos used for passenger service I might up that to speed step 90 which would be 90 mph. Even with the passenger locos having a higher top speed 65 would still be 65 mph. In doing this all the locos are also speed matched to each other. If the throttle is on 35 (speed step 35) any of the locos will be running 35 mph N scale speed regardless of if they are in a consist or running alone. Also nice to see my throttle is on 35 and I know the train is running a scale 35 mph.

I've been figuring the N scale speed by timing a lap around my test layout. Knowing the distance and time I made a spreadsheet that I could use to figure the speed based on how many seconds it took to make a lap. Recently I saw a YouTube where the person was using a track speedometer that sits above and alongside the track. The loco runs through it and the scale speed shows on the display. I looked for one to see how much it is but I think it has been discontinued. So needing a speedometer the SpeedTrap speedometer project was born. The following pages will document building one along with print files for a curved one and for a straight one, a parts list and the software that is needed for the project.

======= About the SpeedTrap Speedometer, Parts List & Print Files =======

NOTE: The following is the build of the 'curved' version of the SpeedTrap. The 'straight' version is built in the same way. Print files for both are up on thingiverse ( HERE ).

N Scale SpeedTrap Speedometer – Pt. 1 …....................................

N Scale SpeedTrap Speedometer – Pt. 2 …....................................

N Scale SpeedTrap Speedometer – Pt. 3 …....................................

SpeedTrap Speedometer Print Files – Pt. 4 ….............................

SpeedTrap Speedometer Software/Sketch – Pt. 5 …................