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Lego Monorail Battery Life and Running Speed

I measured the battery life and running speed of a monorail I built. The course layout is a figure-8, with a lap length of 5,120 mm and a maximum gradient of 5%. I used a monorail I recently built, similar to the Airport Shuttle. It uses a Power Function system, with two M motors in the first and fourth cars. I used Panasonic EVOLTA AAA rechargeable batteries. Based on these measurements, the realistic running time is estimated to be 90 minutes, or at most 120 minutes. The running speed is approximately 300 mm/s from 40 minutes to 90 minutes.