The story of the APT is one of ultimate failure. The pioneering project for a tilting train was headline news in the 1970s and 1980s but it failed as much for political reasons as it did for technical reasons.
The story is still controversial, and many still see it as a missed opportunity.
Yet the legacy of the original APT project is that tilting trains built by foreign competitors run almost unnoticed on Britain's railway network today and much of the power car technology heavily influenced the design of the later InterCity 225s and the Class 91 locomotives.
Now David Clough has delved into recently released archive material and has unearthed a story never before told.
He reveals some of the top-level thinking behind the APT project, internal politics and some of the real reasons for APT's eventual, and expensive, demise.
Analytical and balanced, this is an absorbing read for those who would like to know more about what happened behind the scenes of the doomed APT project.