Which saint is described as having spontaneously decided to travel to Shirdi in a cart with a group of devotees?

The saint who unexpectedly joined a group of devotees on their way to Shirdi was Anandnath Maharaj of Akkalkot. As detailed in Chapter 0, after a group of Shirdi residents including Madhavrao Balwant Deshpande had darshan with him in Savargaon, Anandnath Maharaj suddenly ran and sat in their cart as they were preparing to leave. He insisted, "I am coming with you," and traveled with them to Shirdi despite attempts by others to stop him. Upon arriving, he affirmed Maharaj's greatness by calling him a "diamond."