Describir: A track system for self-tracking dollies /

 _    _      ___      ______     ___      _____     ______    _  __    _____   
| \  / ||   / _ \\   /_   _//   / _ \\   / ____||  /_   _//  | |/ //  |  ___|| 
|  \/  ||  | / \ ||    | ||    | / \ || / //---`'   -| ||-   | ' //   | ||__   
| .  . ||  | \_/ ||   _| ||    | \_/ || \ \\___     _| ||_   | . \\   | ||__   
|_|\/|_||   \___//   /__//      \___//   \_____||  /_____//  |_|\_\\  |_____|| 
`-`  `-`    `---`    `--`       `---`     `----`   `-----`   `-` --`  `-----`