The Subway is a clockport adapter for the A1200 (possibly others) to allow the Amiga to use USB gadgets.
It's not the Subway that allows you to use these, it's the Poseidon software that comes with it that drives the gadgets.
The range of gadgets is large but unfortunately, Chris Hodges has taken down his site so you can't read the supported ones any more.
However, most USB flash drives, CDRW and hard drives work. Also, some graphics tablets, mice, keyboards and so on.
Get one, you'll be glad you did!
