No, for real trainspotting you also need a pencil and notebook, to record the numbers of the engines you see.
Unfortunately this lost some of its glamour with the end of the age of Steam Engines, when the big engines started using diesel, and many "Trains" were made up of DMUs (Diesel Multiple Units) where every carriage had a recordable number, as they could each be self propelled.
Oh! Halcyon days of my long lost youth.