 An urban legend tells that ČKD had wrongly printed the number and RATB sign on a car that was delivered elsewhere, then they sent the last car for Bucharest with the number 3431.However, RATB's documents always mention 130 T4R trams for Bucharest, and not 131.The Tatra T4R is arguably one of the best vehicles the STB (and its predecessors, RATB and ITB) had so far.