Switzerland. Canton Ticino. Locarno. Railway station. Police station Two police officers from TPO (Transport Police) are controlling the identity of an african man from Ghana. The black man is a migrant in an irregular situation (illegal migrant) in Switzerland and does not have any valid legal identity document. He has been arrested by the police officers and will be transferred later in the night to the borders guards. An identity document (also called a piece of identification or ID, or colloquially as papers) is any document which may be used to prove a person's identity. TPO (Transport Police) is the Swiss Federal Railways Police. Swiss Federal Railways (German: Schweizerische Bundesbahnen (SBB), French: Chemins de fer fédéraux suisses (CFF), Italian: Ferrovie federali svizzere (FFS)) is the national railway company of Switzerland. It is usually referred to by the initials of its German, French and Italian names, as SBB CFF FFS. 23.07.2017 © 2017 Didier Ruef