BENGALURU: With the Railways finally permitting traffic and power blockage for a small stretch between Karmelaram and Baiyappanahalli stations on the Bengaluru-Salem line, the Bangalore Metro Rail Corporation Limited (BMRCL) has begun work on its overhead structures above the railway line. BMRCL had recently announced that it would be opening the Baiyappanahalli-Whitefield only up to K R Puram, as work at the railway crossing near Baiyappanahalli is yet to start.