Sunday, 20 March 2011
Tuesday, 15 March 2011
Day trip to Bletchley Park
As ever, please double-click on an image to see it full size.
A few weeks ago in our 'Local' (The Horse & Jockey, Wilmslow) we got to chatting about code breaking and Bletchley Park. I suggested we make a day trip there, and the idea was enthusiastically received by the group. It fell to me, as suggester, to organise it so I looked several weeks ahead in my diary and e-mailed everyone with a proposed date of Tuesday 15th March. Amazingly, all six who wanted to go could make that date, so I collected the train fares from them and made a block booking.
Our 'Old Gits' railcards got us 33% discount, but we did better than that! The card also gave us Virgin peak fares at off-peak prices, so a return ticket from Wilmslow to Bletchley leaving on the 08:11 (changing at Crewe and Milton Keynes) to get us to Bletchley just after 10:00 was £35.20 instead of the £168.00 it would have cost without the card.
First, we had a coffee in the museum's cafe, then joined a tour of the site.
We started by the house, with its history, before moving on to see some Enigma encryption machines, as well as some more advanced Lorenz machines.
The famous and very effective Enigma machine, used by the Germans for encrypting and decrypting messages. One of Bletchley's main tasks was deciphering messages sent by Enigma. The machine uses 'rotors' which translate the typed letter to a different letter, that letter dependant on the setting of the rotor. This Machine has four rotors, and they advance after each character to translate the typed character to yet a different one. In addition, a plug board further scrambles the characters. Operators needed to set up their machines so each rotor and the plug board matched the 'code of the day'.
Enigma rotors
Enigma plug board
The Lorenz machine, a development of Enigma
This dispatch rider's bike was used to deliver documents to and from Bletchley during World War Two. It was ridden by a local man, who at the end of the war didn't know what to do with his motorcycle - so he took it home. After he passed away some years ago his widow donated it to the museum.



The 'James Bond' connection. Ian Flemming worked here, and this place must have been the inspiration for his novels.
Some of the real heroes of Bletchley, not least Gordon Welchman and, perhaps the number one man in code breaking and very early computing, Alan Turing.
Hut 8, where much of Turing's code breaking took placeA stored program computer is a device that can vary its processing steps dependant upon the results of the current step. In other words, it can perform 'conditional jumps' in its program so what it does with the data it is fed depends on the characteristics of that data. A calculating machine, however, will always follow a fixed series of operations regardless of the data fed in.
I spent the second half of the day in the National Computer Museum on the Bletchley site. To a retired career Computing professional (me!) it was so fascinating that I completely forgot to take any photographs! I will remedy that on a future visit. I will be back!
Saturday, 12 March 2011
Crewe Heritage Centre Charity Weekend
First, a little rant about the APT
Resident at the Centre is the Advanced Passenger Train (APT) a tilting train developed by British Rail engineers in the '80s. It showed considerable promise for high speed use on the West Coast Main Line (WCML), but was cancelled through lack of funding. The 'tilt' technology was sold to the Italians, who developed it into the Pendelino which today provides Virgin's high speed service on the WCML.
Gerry Bates, a development engineer on the project, had strong feelings about the premature cancellation of what was undoubtedly a sound technical proposition. On 13 July 2001 he had the following letter published in The Guardian:
"My blood boils when the myth is propagated that British Rail's advanced passenger train was a failure (Tilting at time, July 10). The only failure was the PR.
"The embarrassing inaugural run was forced on the development team by BR's senior management when there were still problems to be ironed out. There were complaints from members of the press that the tilt system made them feel nauseous, but there is some suspicion that liberal hospitality may have made a contribution to this.
"After the media demolition job, APT development continued and the train began to show promise. As a member of the BR research team responsible for measuring the effect of high-speed trains on the overhead power collection system, I was usually trackside during APT tests, but I grabbed the chance of a ride on one of the test runs.
"On the sinuous section of the west coast main line from Gretna to Beattock, on a rising gradient, the speed was held at 155mph. To describe the experience as exhilarating would be wrong - it was without fuss and I felt none of the ill-effects earlier commentators alleged they had suffered.
"The APT holds the UK rail speed record of 162.2 mph, achieved on December 20 1979. Britain's present fastest train is the Eurostar, which daily reaches 186mph in service, but this speed won't be achieved in Britain until the first section of the Channel tunnel rail link is opened.
"APTs went into service, with no fanfare, replacing ordinary electric services on the Glasgow-Euston run, but the BR board lost its nerve and funding was withdrawn. If it weren't for this we could be selling tilting trains to the world rather than the other way round."
To view any of the following pictures full-size, as usual please click on it twice.
WCML to Preston and the north to the right.
Crewe North Junction signal box. Here, a Super-Voyager heads north out of Crewe station on an Edinburgh service.
Manchester, a London Midland Liverpool to Birmingham service occupies platform 5 in the station, while a class 323 electric multiple unit waits to enter the station to form a local stopping service to Manchester. The 'Crewe Arms' hotel is in the background.
locomotive, showing the piston some way down the bore.














