Melksham branch passing loop: 

The Melksham branch is a long single line and has to be completely cleared in one direction before another train can enter from the other direction. A passing loop on the branch would allow much greater flexibility over the timetabling of services and also provides greater performance resilience by allowing trains to clear the mains lines at either end during times of disruption. 

Greatest flexibility and performance benefit is generally achieved by a passing loop being built at a station, however this does increase the cost due to the need for a second platform and (typically) the provision of an accessible footbridge as well. The optimum location for a new passing loop would be subject to an options study looking at land availability, costs and benefits.

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