7/9 Poets aren't generally known for their love of the hard sciences, such as engineering and construction. Nevertheless Roger McGough introduces requests for poems that celebrate the great inventions, among them, steam trains, bridges and the humble bicycle. Producer Mark Smalley Repeated on Saturday at 11.30pm BBC AUDIO: A newly released special edition celebrating 25 years of Poetry Please is available on CD from all good retail outlets or from www.bbcshop.com. Call [number removed]