Heavy rail commuter and passenger companies adopted the concept of a blended passenger movement service. Light rail and busses were basically used for short and medium distance commuters and heavy rail systems were used for medium to long distances. Light rail being to blended rail providers are buses on rails but being electric powered. The safety issue is they are extremely close to vehicular traffic causing lost to lives and highway and light rail infrastructure in the event of a collision. The only light rail system I am familiar with was the historic Newark Subway System using PCC cars and completely separated from street traffic.How very tragic .. my heart goes out to the conductor's family.