Why is it that when diesel trains don’t use electric pickup even though they could?

Question by prof. Jack: Why is it that when diesel trains don’t use electric pickup even though they could?
If the trains are diesel/electric then surely they could have a pickup to collect electricity from the wire/third rail, where I live there is a railway line which for half of its way is diesel, but the other half is electric (it joins to an electric one) why doesn’t this train use both sources? (It’s the Uckfield – London Bridge Line). I have seen it on French, Dutch, German and Czech railways. Surely the cost of diesel is higher than electricity?
okay, I mean a train using diesel as a fuel EVEN THOUGH it is on a track with electrical pickup avaliable
and that the train is a diesel/electric one; so it uses electric current anyway, apparently the trains on the railway line near to me are “Turbostars”

Best answer:

Answer by RiverRat
The cost to run those wire thousands of miles is mind boggling

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