Is there any effective difference between a light rail system…?
Look up trolleybus. It’s an electric bus that gets power from overhead lines, similar to light rail vehicles. It has tires, looks like a bus, and runs like a bus, but one can’t pass another one except where there is dual power. The advantage of the trolleybus is that it doesn’t have to follow a ground track, just the overhead wires. So it can change lanes to pass a gas-powered vehicle. However, it doesn’t usually have as much capacity as light rail. It’s been around for about 100 years.
