SS Dwarka owned by P and O Steamship Company served the route between Kuwait and Bombay stopping at Karachi harbor on the way. It took workers from Kerala to the Gulf and back,. “Deck with food’ in 1982 cost Rs. 1100 per trip. In 1960s the cost was Rs. 45 per trip. Mohammadi Steamship Co. were the agents in Karachi.
Other ships belonging to the same company were Dara (which caught fire and drowned in Dubai), Dumra, Sirdhana and Sinthia. Another company Scindia owed Sabarmati and Saraswati plying between Karachi and Bombay.
Dwarka made her final journey in 1982 and was dismantled at Gadani on Makran Coast west of Karachi. May she rest in Peace! (AHK June 24 2019)
Good Old Karachi 
Dear Sir,
Could you tell me more about that ship?
For instance, did you know about her frequency and the time it took to her to travel from Karachi to Mumbai, back in 1980?
Thanks,
Michael