Mubarak carried on different activities that helped Kuwait gain more power and sovereignty apart from the Ottomans. Mubarak allowed exclusive rights for Britain to set up a post office in Kuwait in 1904 and in 1905-06 it was being considered that Kuwait should fly its own flag instead of the Ottoman standard. However, neither the post office nor the flag would happen until World War I. Mubarak as well, in October 1907 sold the rights for any terminus railroad sites to the British, compromising the German-Ottoman plan to extend the Berlin-Baghdad Railway to the port, which would have given them access to trade on the Indian subcontinent. In exchange Mubarak received £4000 per year and a promise that Britain would recognize Kuwait's autonomy and the Sheikh's power over it.