In the age before cars, many cities had such a railway (sometimes a branch or spur of an existing line that’s conveniently close). Some even had special stations for mourners to use, like the gothic-style Mortuary Station in Sydney.

I wonder if Londoners ever referred to the Necropolis Railway as the Necropolitan Line, in the way that they referred to the Overground as the Ginger Line and the Gospel Oak-Barking Line as the Goblin.