Not just the media. TfL issued a press released on 7/7 saying the
Piccadilly Line train was 311. I wrote to TfL asking if it was a typo,
311 for 331. They replied saying that it was due to incorrect
information received and that they had corrected their records when
advised.

On 7/7 Transport for London were saying:

14:25 Transport for London Update

Latest information confirms that there were four incidents on London's
transport network this morning, three on London Underground and one on
London Buses.

At 09:46, the London Underground was suspended and all stations
commenced evacuation following incidents at:

* Aldgate station heading towards Liverpool Street station on the
Hammersmith & City line;
* Russell Square station heading towards Kings Cross station on the
Piccadilly line;
* Edgware Road station heading towards Paddington station on the
Hammersmith & City line.

http://www.tfl.gov.uk/tfl/press-cent...t.asp?prID=411

By 9/7 the story was :

Tube train bombs simultaneous

London Underground, the Metropolitan Police and the British Transport
Police can now confirm that the three bombs which exploded on three
Tube trains on Thursday 7 July 2005 went off simultaneously at around
08.50.

Explosions were as follows (in succession):

* Circle line train number 204 heading eastbound from Liverpool Street
station to Aldgate station.
* Circle line train number 216 travelling westbound heading from
Edgware Road station to Paddington station.
* Piccadilly line train number 311 travelling from King's Cross St
Pancras to Russell Square southbound.

The question arises: was 311 in the vicinity, eastbound

Just to recap the Blue Watch article:

The "Blue Watch" article does not give a train number. Instead it
describes the train as the 8.51am service. This can only be taken as an
actual departure time, since the trains were running late. It also
describes the train as follows:

"It was the 48th such service to leave London's busiest tube station
that morning, each carriage crammed with commuters, many reading the
newspaper coverage of London's Olympic triumph the previous day."

However it does give a carriage number, 346A. It is mentioned no less
than 11 times, including the title. 346A is described as the first
carriage twice. But car 346 cannot be the first carriage. It can only
be the third or fourth from the front. In addition it is a D car.

Later on in the article we have:

"The call-out that came at 9.04am on 7 July seemed as routine as they
come. Roche and his crew boarded engine Alpha 242 and set off. In his
hand a strip of tickertape read: 'Smoke issuing at Euston Square tube'
alongside the order that they should head as back-up to King's Cross
nearby. They remember the traffic being bad. By the time they pulled up
outside King's Cross, it was 9.13am.

Seventeen minutes earlier, three bombs had crippled the network but, as
Roche trooped on to the station concourse, his was the only emergency
vehicle parked outside the network's most vital hub."

Seventeen minutes before 9.13am is 8.56am, the original time given for
the Piccadilly Line explosion. The article was written in October.

This is so odd it can hardly be explained by sloppy journalism. Spot
the deliberate mistakes.