The term 'Suburban Street Liners' refers to a type of bus service that operates in suburban areas. The buses are usually smaller than those used in urban areas and are designed to provide transportation to and from residential areas. The acronym ELMS stands for Electric Low-Floor Midi-Size, which is the type of bus typically used for this service. These buses are powered by electricity and have a low floor, making them easier to board and exit. They also have a mid-size capacity, allowing them to accommodate more passengers than smaller buses.