Directed Track Maintenance (DTM)

Definition

                It is a method to maintain the track as directed by day-to-day requirements but not as prescribed routine.It is also called Track Maintenance System (TMS). Directed Track Maintenance is consists of 3 stages: 1) Proper identification of defects in track geometry by means of measuring and recording devices. 2)Rectification of these defects only at indicated locations in order to maintain the track to predetermined standards. 3) Checking the quality of work and output by the supervisor in-charge of maintenance.

Objectives and Scope of DTM

The basics objectives of DTM are:

• To maintain the track to a high standard of maintenance as per the prescribed tolerances.
• To achieve economy in maintenance by avoiding unnecessary work involving men and materials

In order to achieved desired objectives, the following special features are incorporated in DTM i.e the conventional system of maintenance.

• The level  of supervision id improved by hiring well-trained and qualified permanent way workers.       
• A thorough record of the track defects identified before and after the completion of work is maintained to assess the inputs and also to help devise remedial measures of a more permanent nature by carrying out a scientific study based on the assimilated facts.
• Increasing the length of the unit especially on single lines increases the number of the workmen available, resulting in an improvement in the productivity of the worker as well as the quality of work.
• The track is aimed to be brought to a predetermined level of service tolerances.

The best or strength of DTM worker is fixed in such a way that work can be effectively under the control of supervisor in-charge of work(usually 15 to 25 workers).   

DTM is carried out systematically from one end of the section to another on a need based programme rather than attending periodically. DTM method is used to check the track geometry and conditions continuously so as to maintain the track within prescribed limits throughout the service life of the track.