It's about including a week speaking on popular transportation system going from station to station (4,4)

'station' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'it's about including a week speaking on popular transportation system going from station' is the wordplay.
I cannot really understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'popular' could be 'in' and 'in' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
The remaining letters 'rill' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'to' is the link.

Can you help me to learn more?