Three bidders have expressed their interest to supply coaches and rolling stock for the Bengaluru Suburban Railway Project (BSRP), Rail Infrastructure Development Company (Karnataka) Limited (K-RIDE) said on Wednesday. The bidders are: Spanish company Construcciones y Auxiliar de Ferrocarriles (CAF), Bharat Heavy Electricals Limited (BHEL) and Bharat Earth Movers Limited (BEML), K-RIDE said in a statement.