The trolley switch cannot store energy

In 2019, SFMTA discovered their historic cable cars were wasting 18% more energy than modern systems—all because switches couldn’t recover braking energy. The fix? Installing ultracapacitors at key junctions, cutting energy waste by 31% in six months. But in the world of urban transportation and electrical engineering, this limitation is very real—and surprisingly impactful. The inability of a switch to store energy lies in its function as a control device, not a storage medium, 2. While the trolley switch itself remains energy-storage challenged, adjacent technologies are picking up the slack: Portugal’s capital recently tested trolleys with roof-mounted solar panels. Trolley circuit breakers operate by using electromagnetic mechanisms, which allow them to store energy efficiently, distinctively through mechanical compression, and spring action; hence, it utilizes both kinetic and potential energy principles.