A film to tell gangers and lengthmen how the Hallade Track Recorder makes a continuous record of the movements of a train during a journey and so shows up the good and bad places in the track. Hallade records are of value to all permanent-way men because they help in the detection of track faults.

16mm & 35mm

Additional Notes: Film No. BT20 / BT25 was to have been called 'The Abtus Ballast Cleaner' but was cancelled during production in 1950. 'The Hallade Track Recorder' was to take its place.