Cogload Junction was a flat junction which meant that trains from Taunton to Castle Cary had to cross the line used by trains from Bristol to Taunton. On 15 November 1931 a flyover was brought into use to allow the down trains from Bristol to pass above the two Castle Cary lines, and from there to Taunton and Norton Fitzwarren there were now four running lines. From East to West these were: Down Bristol, Down Castle Cary, Up Castle Cary, Up Bristol, but crossovers at Cogload were added later that allowed trains to run on the adjacent line when necessary.
