Public transport lines filling routes by going all over the place (10)
I believe the answer is:
trolleybus
'lines filling routes by going all over the place' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'public transport' is the wordplay.
'public' becomes 'trolley' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'transport' becomes 'bus' (busing is a kind of transporting).
'trolley'+'bus'='TROLLEYBUS'
Can you help me to learn more?
(Another definition for trolleybus that I've seen is " Electrically driven public service vehicle".)