1,152 km
Euston tube station was created in 1968.
Euston Railway Station in London, England, was built originally in 1837. As the United Kingdom's sixth busiest railway station, Euston Station was rebuilt and expanded from 1962 to 1968.
The Trainline web-site says - take a tube train from Euston to Paddington, then a first Great Western service to Reading. Journey time Euston to Paddington is 28 minutes and Paddington to Reading is 25 minutes.
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Take the tube to London Euston and get a train from there.
By tube (underground). Take the Northern line from Euston to Tottenham Court Road and change onto the Central line to Marble Arch.
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Take the tube to Piccadilly Circus, then the Northern Line to Euston. Get on the Euston-Wolverhampton train and change there for Shrewsbury.
Berkhamstead is too far out to be served by the tube. There is a mainline service to London Euston.
Glasgow Central to London Euston, short walk to Euston Square tube station, then on the Hammersmith and City line to Hammersmith.
The best option is to walk to Euston Square Station - which is well signposted and a two minute walk from Euston Station. Then, take the Hammersmith and City Line, Circle Line or Metropolitan Line to Liverpool Street.
Yes, all London mainline stations have an underground station as well.