Concrete sleepers type F27BS with JG5 shoulders investigations following the skewing of a shoulder in service (TM-CES-124)

Concrete Sleeper Working Party Minute 87/5 referred to a JG5 type of shoulder noted as being skewed in service in a relatively new F27BS sleeper, and the author was asked to investigate the cause, particularly whether the shoulder had twisted as a whole, the head had twisted on the stem,...