Above represents the mechanical door that open it self without power from any electric or disel motor... once the car gets on the platform the weight of the car lowers the ramp and which will pull the connection rod down which will make the cross door open.
below is cad drawing which illustrate the design.
white lines show how it will be open when the car go on top of the yellow lines, yellow lines represents the ramp which the car will pass over. the green line shows the tension rod which will pull the pink lines making it white lines.
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