A reasonable choice for the name of a hidden platform bettwen platforms 9 and 10 is platform 9 1/2.
Platform 9 3/4 is a reasonable choice for a name for a platform between platforms 9 1/2 and 10.
What happened to platform 9 1/2?
Platform 9 3/4 is a reasonable choice for a name for a platform between platforms 9 1/2 and 10.
What happened to platform 9 1/2?