For the extremely poor to reach workplaces in town easily consumed 2 hours, before they could board the Metrorail System. So the idea was floated to use a Cable-Gondola System known today as Metrocable. Moving at 12 MPH over the City without stop lights or traffic is amazing. Linked with Metrorail the system is a smashing success and World model. Today Lines K, J, and L, are in operation and H and M are under construction. Free to the poor.
Metrocable could work anywhere where Mountains, Rivers or Rail Yards cause issues. Cost is less than rail or advanced BRT.