Passage: The museum was formerly the Museum of Lenin’s funeral train. It still houses exhibits relating to Vladimir Lenin's Funeral train including the 4-6-0 steam locomotive U-127 (Russian У-127) and Lenin’s funeral van No 1691. The collection of exhibits has been expanded and it now also houses many artifacts concerning the Moscow Railway and the history of Russian Railways from the beginnings of the railways in Russia to the present day. The collection includes models, displays, documents, photographs, uniforms and items of railway equipment. U-127 is the only surviving Russian locomotive class U.

Question: What was the funeral van number for Lenin?
1691