I still don't have all the pieces but for now I've been able to move forward.
Again, thank you so much for your time and dedication.
By the way! I will finally use Lego motors to move the caterpillar because really in relation to the price (from Chinese suppliers) it has an incomparable performance.In the end what I will adapt to Lego is the stepper motor, which governs small lifting platform (with the parallelogram technique) to access the caterpillar. First it had to be a ramp, but if the ramp has to comply with the slope regulations, it no would fit on the train, so a small lifting platform.
- Oracid aime ceci