Many of the routes of most of the agency's current bus lines are based on the original streetcars operated by the Baltimore Transit Company and its parent companies from the 1890s to the 1960s. All these routes were ultimately converted to rubber tire bus operations, and many of them were consolidated, extended into newly developed areas, or otherwise reconfigured to keep up with the ridership demands of the times. Additional routes and extensions were added in later years to serve communities that were later developed, and to feed into Metro and Light Rail stations that were later built.