The short distance from the junction with the SWR (Myrtle Hill Junction) to the C&CR Carmarthen station was opened on 1 March 1860; the South Wales Railway station was renamed "Carmarthen Junction" on the same day. It had been intended to open on 1 November 1859 but the mode of the junction was objected to by the SWR engineer. This was followed by opening of the line as far as Conwil on 3 September 1860; there was an intermediate station at Bronwydd Arms. The C&CR relied on the SWR to work its line, and friction developed when the C&CR claimed that the charges for this were excessive. Whatever the truth of that, the C&CR was not earning enough to pay the working expenses and the service was suspended after only four months' operation, on 31 December 1860. There were outstanding debts to the SWR which the C&CR was unable to pay, and the SWR seized £1,343 worth of rails and sold them.