The Fundamental Design Calculations, plus the use of 21 st Century Design Tools and Techniques are the foundation of the Trust’s capability to offer its services to the heritage railways, mainline steam locomotives and new-build steam projects. Features of the 5AT included:

The Advanced Steam Traction Group (AST Group) was established in 2012 following the closure of the 5AT Project. The group consists of the Advanced Steam Traction Trust – ASTT, a not-for-profit company, and Advanced Steam Traction Services Ltd – ASTS, which undertakes commercial activities on behalf of the Trust.

The 5AT Advanced Technology steam locomotive was a conceptual design conceived by the British engineer David Wardale, [1] and first described in his 1998 definitive work on modern steam, The Red Devil and Other Tales from the Age of Steam.

5AT team members set up the AST Trust in 2012 following the demise of the 5AT Project, inheriting from it the knowledge and experience gained from extensive studies conducted for the 5AT Project, together with the Fundamental Design Calculations prepared by David Wardale for the 5AT locomotive, and a large amount of supporting documentation ...

In reaching its decision to suspend further work on the 5AT Project (see announcement page), the group's members have moved on to establish the Advanced Steam Traction Trust (AST) for the purpose of taking forward the knowledge gained from their work on the 5AT.

5AT Group aims to ensure the future of steam on the rail network, via mods to increase locomotive performance & reliability, reduce both carbon emissions and minimize operating & maintenance costs.

2017年4月2日 · The 5AT Group was founded in 2000 to support the development of David Wardale's 5AT locomotive. The project was abandoned in early 2012, when funding could not be secured.

The 5AT "Advanced Technology" Steam Locomotive Project Beginning around 2002, Wardale began serious work on the design of a new steam locomotive for excursion service in the UK and elsewhere.

明显5at是最差的，还不如6at、8at，甚至比9at、10at都差，实现5个挡位所需的齿轮机构、离合器/制动比14at都多，非常不合算。 因此，5AT想做到体积重量小，十分困难，肯定在AT变速箱的技术迭代中首先被淘汰。

The 5AT was an advanced and modernised steam locomotive based on the BR Standard Class 5. The improvements were the work of locomotive engineer David Wardale, based on the principles of L.D. Porta. The intention was to produce a modern locomotive with improved performance, efficiency, reliability and economy.