Lost items in Barcelona bus, metro or tram. Lost something in Barcelona public transport. What to do if you have lost or forgotten something in Barcelona in a bus, in a metro train or in a tram. You can contact Barcelona's TMB transport services to check if the item you lost on TMB services has been found. To check this fill in the form on the TMB website lost items page. If it has been found, then it will be taken to their their Lost Property service Punt TMB Diagonal at Diagonal metro station customer service centre where you can collect it within minimum 48 hours by showing your ID card (or equivalent). Diagonal is a metro station for L3 and L5. You can also authorise someone to collect the item for you, who must bring a signed authorisation from you, along with a photocopy of your ID document and their own original ID document.

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