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How can i find the wtc without tt in train is bolt is helpful

A little more detailed explanation of your issue is and what you’re trying to achieve would be helpful

I am trying to make a device from which we can stop the people without ticket in train

okay. Now do you have a solution in mind which you want to ask advice about or are you looking for an idea with bolt that can give you a solution?

Maybe you could try something with a RFID tag.