From its opening day on October 26, 1903, until the end of passenger rail service on April 20, 1958, the Key System always stood out from other interurban railroads through its fleet of varied and unique cars that were all built to meet the demands of this Bay Area institution. This iconic fleet ranged from the electrified horsecars, which introduced modern electric traction in Oakland and Berkeley, to the modern articulated interurban cars whose designs informed the light rail vehicles (LRVs) we know today. For today's Trolley Tuesday, let's look back on these iconic cars and get to know them just a little better, shall we?