Mumbai Double Decker Bus: “This is the last chance for the firm to hurry up and provide the prototype of the bus, else we will not take this contract any further and initiate stringent action,” he warned. Sources said “permanent blacklisting” will make it difficult for the private firm to seek contracts in other bus undertakings across the country. The wet lease twin-deck buses will come for a cheaper lease rent of Rs 56 per km — one of the lowest rates in the country — which is the reason why BEST is keen on the project, sources said. If BEST goes for a fresh tender, it will come with “risk and costs”.