Fair point. I would say I'm using these definitions:

There is no standard definition, but in the United States (where the terminology was devised in the 1970s from the engineering term light railway), light rail operates primarily along exclusive rights-of-way and uses either individual tramcars or multiple units coupled to form a train that is lower capacity and lower speed than a long heavy-rail passenger train or metro system. https://en.m.wikipedia.org/wiki/Light_rail

In North America, heavy rail can also refer to rapid transit, when referring to systems with heavier passenger loadings than light-rail systems,[1] but distinct from commuter rail and intercity rail systems. It is characterized by high-speed, passenger rail cars running in separate rights-of-way from which all other vehicular and foot traffic are excluded. https://en.m.wikipedia.org/wiki/Passenger_rail_terminology#Heavy_rail