Your query returned 2 results.

• Predicting the Effect of Fouling on Trackbed Deterioration,
  N.H. Thom and Q.-L. Fei
  Paper 1.12 from CCP: 110, ISBN 978-1-905088-65-2 (2016)
  
• The Effect of Under-Sleeper Pads on Trackbed Deterioration Rate,
  N.H. Thom and J. Roberts
  Paper 143 from CCP: 98, ISBN 978-1-905088-53-9 (2012)