Jagmal Raja Chauhan carried on father's legacy, who joined him at an early age of twelve to get practical knowledge of building bridges and laying rail lines.
The name plates mentioning Erection & Caissoning done by Rai Bahadur Jagmal Raja, Allahabad, can still be seen riveted on each girder of Bally Bridge.
The Rao entrusted the job to build the mansion to Jagmal Raja, who personally built Cutch Castle in the 1920s in Bombay.
[1][4][5] In 1932 upon completion of Bally Bridge, Jagmal Raja was recommended by Viceroy of India to King of Nepal, who needed a contractor of repute to do renovation and rehabilitation of his royal palaces & temples.
[1][4][5] He was also involved in construction and erection Darya Mahal, the second monumental residence of Maharao Khengarji III of Cutch, which was commissioned in 1940.
In 1919, his glass factory at Naini was visited by Sir Harcort Butler, the Lieutenant Governor of the United Provinces of Agra and Oudh.
[4] Jagmal Raja was one of the promoters with other Gujarati businessman of Bombay - Haridas Madhavdas, Vijaysinh Govindji and Vithaldas Kanji of a shipping company named Shri Ambica Steam Navigation Company, which was founded in 1945,[17] It operated in western coast of India having its head office at Bombay.
Like many members the Mistri community of Kutch to which he belonged, he owned coal mine named Rajapur Colliery near Jharia,[1] which he held in partnership with Manji Jeram Rathod of Madhapar.
Jagmal Raja was quick to capitalise on this opportunity and took on contract the Bhuj- Anjar – Mundra bus route, which he operated till 1948, when Cutch merged into Union of India.
[3] He worked as a private banker from Jharia with his trusted partner Manji Jeram Rathod of Madhapar and used to give loans and funding especially for coal mines business.
Sir Maharao Khengarji, as a mark of their friendship, honoured Jagmal Raja, by his presence, when Degree of Engineering was conferred upon him in London.
[1][2][7] Although, he had studied up to fifth standard in his native village (Nagor), he had the distinction of being conferred with Degree of AEIE (UK) on recommendation of Viceroy of India, Lord Irwin.
[3][4][13] Besides Nehru family he also held personal relationship with Malviyaji, Mahatma Gandhi, Sardar Patel, Lal Bahadur Shastri, C. Y. Chintamani, Dr. Rajendra Prasad, C. Rajagopalachari, V. V. Giri and always helped liberally for Indian Independence Movement.
Jagmal Raja Chauhan, who was among top industrialists in Bombay and had relations with Tatas, Birlas, Wadias, Bajaj, Walchand.
[32][33] He built an ashram with a huge Dharamshala at Jhusi having more than hundred rooms and other facilities near Allahabad on banks of river Ganges.
Further, he instituted several funds for charitable works, education scholarships, starting sports shield and medical benefits.