Nowadays, many trams have no signs, and those signs are manually posted. Mainly depends on whether there is a certificate on the car, and what brand is on the certificate. Many tram brands belong to one manufacturer, such as Qi Hao. There are two kinds of invoices, one is a printed version and the other is a handwritten version. Mainly depends on whether the stamp on the invoice is an invoice stamp. Whether it's true or not, you can check it online.