HBL Power Systems Ltd manufactures Train Activated Warning Device. HBL Power Systems Ltd is an ISO 9001:14001 certified company. The Train Activated Warning Device is a microprocessor based warning system at Railway Level Crossings that gives an audio visual warning to road users, to reduce the risk of accidents significantly. The Train Activated Warning Device can be used at both manned and unmanned railway level crossings in both electrified and non-electrified sections.