beautiful bronze casket, costly... in the future, when the means of transport become so rapid

The Superintendent escorted them to the best piece of land he had, on the highest part, and in the centre of the cemetery. It adjoined one of the roads and was bounded by three great trees which cast their shade over it. The peaceful woods of the countryside, where birds will make their nests in spring, lay close to it on one side. It was over thirty metres square, and Ruhiyyih Khanum made arrangements to purchase it immediately, instructions being given to build a strong, deep vault. The Hands then proceeded to the undertaker's, to choose a suitable casket for the precious remains of the beloved Guardian. After much deliberation it was decided that for the present, as well as the future, the wisest course would be to have a lead coffin which could be hermetically sealed, and that this should be placed in a beautiful bronze casket, the most dignified, costly and enduring that could be found. By doing this the Hands were assured that in the future, when the means of transport become so rapid that the journey from London to Haifa can be accomplished in an hour, it would be possible to convey the sacred remains of the Guardian to the Holy Land.

(The Passing of Shoghi Effendi: 1896-1957 by Amatu'l-Bahá Ruhiyyih Khanum in collaboration with John Ferraby, London: Bahá'í Publishing Trust, 1958)

https://bahai-library.com/ruhiyyih_passing_shoghi_effendi