OK as one who claimed 8, I will give it a go
1. Closed Stations
2. All towns have a London Road Station
3. Piers
4. Tram train projects (though obviously Portishead is still only an idea)
5.

?
6. Washington Metro Stations
7. Ferry Stations
8. Mersey Tunnels
9. Transporter Bridges
Likewise ...
1. Closed in the 1990's
2. All include the word "Go"

- that was my punt!
3. All have narrow gauge railways.
4. Tram-trains -planned or actual
5.

?
6. Rapid transit stations
7. Ferries
8. Mersey tunnels
9. Transporter bridges.
As someone who looked, though about commenting but then did not post my score knowing I was out of the running, I'll kick off with what the ones I think I got were-
1 - Stations closed in the same year (1994?)
2 - Stations on the original Cross Country (pre-Arriva) network
3 - Closed stations not an current active routes/services
7 - "Ferries" as already posted
9 - Transporter bridges, again as already posted
PS - just seen someone arrived before me!
1. Spot on eightonedee - all closed in 1994
2. London Road it is (Nottingham is closed, other ones open)
3. Yes - Narrow Gauge Railways and indeed
there's something more specific4. It is indeed Tram trains running or being looked at
5. Ah -
has anyone got this?6. Yes, Stations on the Washington
DC▸ Metro. I wondered whether to include "Foggy Bottom" which amuses me
7. Ferries
8. The Mersey Tunnels - Kingsway and Queensway are road and the railway tunnel (surprise ...)
9. Transporter Bridges.