Question: what does The Prospect of Whitby in Wapping a district in London Docklands lay claim to being the oldest of?  
Sentence (from "Docklands Light Railway rolling stock"): Docklands Light Railway rolling stock is the passenger trains and service vehicles (collectively known as 'rolling stock') used on the Docklands Light Railway (DLR), which serves the London Docklands area in the east of London.
Relevant evidence: No