It's the longest time taken between platforms. Physical distance isn't everything.All true (and very tragic), but don't see how this is relevant to the thread, as the platform to platform distance is short.
Normally at a two-platform there's little or no need to get between the platforms (apart from the staff of course), you are either arriving or departing. Elsenham had been set up as an exception, you needed to go to both to get a Down service.