appearance confined display displayed driving-force energy engines equipment force heavy heavy-duty historical history locked locomotives machinery machines mobility pistons power powerful rails railway railway-yard restoration restoration-yard restored steam-engines steam-locomotives steam-trains strength trains transportation wheels barrier carriage-end carriages coaches connected connection door end grille handles heritage mat metal open passengers platform restore train transport travel wood wooden access-limited advice advising alert appropriate-behavior appropriate-behaviour authorised-entry-only authorized-entry-only behave behavior behaviour black care caution communicate communication concern confined-space danger dangerous information informing lettering limited-access limited-permission limited-space red restricted restriction restrictions risk risks risky safety sign signage unauthorised unauthorized warning warning-sign white animal-care animal-welfare animals appalling-conditions barred bars cages concrete construction damaged decay deteriorated deterioration dilapidated disused early example exhibit exterior external inadequate inappropriate inferior-facilities outdated overcrowded past Remains reminder secure security set-aside shadows stones stonework structure sunlight sunshine unacceptable welfare zoo beak beaks blood-flow captive captivity Chinese-white-dolphin clever coastal-animals color coloration colored colorful colors colour coloured colourful colours conservation contrast contrasting dark-spots entertaining entertainment environment environmental Indo-Pacific-humpbacked-dolphin mammal marine-park medium-sized near-threatened oceanic perfoming performance pink pink-dolphins skin Sousa-chinensis spots spotted teeth wild wildlife