 Complete the following phrase:  Rail transport was first introduced in Myanmar in May 1877 with the opening of the Yangon to Prome line by The Irrawaddy Valley State Railway when Lower Burma was a British colony. Unusually for a British colonial railway, it was built to . Subsequent development was to the same gauge, though the Burma Mines Railway opened in 1906 operated on a separate gauge. In 1884, a new company, The Sittang Valley State Railway, opened a line along the Sittaung River from Yangon to the town of Taungoo via Bago. After the annexation of Upper Burma following the 