How big was Diplodocus carnegii?

Diplodocus carnegii - the dinosaur species Dippy is a replica of - was 24-26 metres long and probably weighed up to around 15 tonnes. They were sauropods with extremely long, whip-like tails. 

For comparison, a London double-decker bus is around 14 metres long and weighs 12 tonnes.

Get to know some of Dippy's enormous sauropod relatives that lived in Britain during the Jurassic Period.