I'm trying to remember when that old line was last used and what it was for.
Before the line was severed at the junction the stub was used by Network Rail to stable on-track plant. And before that the stub gave access to the Waste Transfer siding behind St Phillips Recycling Centre. From there the 'Avon Binliner' trains ran to the landfill site at Calvert in Buckinghamshite. The last Avon Binliner ran on 1st April 2011.