I am grateful to several people for permission to use photographs. These include David Fletcher of Sheffield University, René Heyder of DB, Maurice Verheijen of Schweerbau GmbH, Brian Whitney of Network Rail and Charles Frederick, formerly of BR Research, to whom I am particularly grateful.
This contribution was initially drafted as a booklet for publication by a major supplier of railway equipment. This web-based presentation is intended to complement and be more widely accessible than that hard-copy publication. It can also be more readily updated.
Dr Stuart L Grassie