fish

[janeevans]

What is the specific answer that connects:

Pike. Guppy. Shark. Sole. Roach.

[sddsddean]

I take it by 'specific', you mean more than they are all fish.

[janeevans]

Yes, I know they are all fish but what else connects them.

[keithlbw]

They all have fins!

[sddsddean]

I've got an idea Jane, but I'm not sure its right. Give me a day to check and I'll get back to you.

[sddsddean]

Checked a few sources and I reckon the answer is that they all are (or have been) types of British railway wagons. Can't give all the types, but a Shark is a 50tonne bogie hopper wagon. In a similar vain,the Dogfish is a 21tonne hopper wagon. I checked with freinds on another site ('cos I'm into trains) and an ex railwayman confirms the above answer.