No, the British Rail class 444 train is not identical to the
British Rail class 450 train. These trains are slightly different
but made by Siemens Desiro.
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British Rail Research Division was created in 1964.
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The manufacturer of the British Rail Class 700s was Siemens.
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The National Rail Enquiries is a good British rail route
planner. There's also the Route Planner rail website, the Train
Line, Network Rail, and Transport Direct.