Current Collectors for Overhead System With Their Application: 1. Trolley (Pole) collector: It is used for trolley buses having speed range from 20kmph to 32kmph. 2. Cable collector: This system consist long cable and power driven reel is carried by locomotive. It is used where track route is exposed to dangerous gases, dust and chemical. 3. Bow collector: It is used for tramways having higher speed range. 4. Pantograph collector: It is used for main line service locomotives, urban trains, suburban trains etc. having higher speed range.