How is london 'overground' different from a london underground train which does not run in a tunnel?

Question

How is london 'overground' different from a london underground train which does not run in a tunnel?

Answer 1

London Overground is a new name recently adopted for services taken over from the surface companies by Transport for London and mainly include the lines centred on Willesden Junction - the West London line to Clapham Junction, the Euston Watford DC service, the North London Line from Richmond to Stratford and the branch from Gospel Oak to Barking. This will be joined  in 2009/2010 by the refurbished East London line from West Croydon to Dalston Junction, eventually to be extended to Highbury and Islington. All lines will have new stock to be introduced from next year - the electric lines class 378 Electrostars (like those used on the Southern Railway and South Eastern Railway services) and the Gospel Oak-Barking, unelectrified line, by Turbostars.

Answer 2

ohhh, I really dont know

but the wise guy in me has to say it is easier to read the newspaper in the above ground train.

sorry, I can't help myself at times.

It's the medication.