Go karting on abandoned railroad tracks! Homemade train with dog

Please, Read my comment below before downvoting or asking about the dog

Last summer, I built this wooden rail go kart from scratch. It's powered by a 8HP 'motorised cultivator' briggs and stratton engine. It can go up to 50km/h (31mph), the speed is not limited by the engine but by the weakness of the wooden base. (it starts vibrating quite a lot around 50 km/h).
The 20km long railroad track has been abandoned for more than 10 years and is quite steep for a railroad. The maximum steepness is 20mm/m (2%) but it is often close to 10mm/m (1.5%)
Fun fact:
The last train that drove on this railroad never got to the train station, as the modern passenger train got stuck on the 20mm/m part of the tracks because of the wheels losing grip!

Summary:
0-24sec == Quick view of the railcart
24-52sec == A ride with my dog
52-1min34 == My dog running behind the cart (No abuse, he loved doing it, if he was on it he would constanly try to get off so he could run)
1min34-end == A ride from my home to the end of the track
Click here to see a slideshow with some photos of my rail cart:
https://www.youtube.com/watch?v=Am5RQc1_yus

Click here to see the original video:
https://www.youtube.com/watch?v=4gv67mxV5TY
Unfortunately, some people destroyed it and stole the valuable parts, there is not much left of it, only the wooden base and the seats

Rail cart
Trolley
Draisine

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