1.  Association President Edwin Harper said the benefits of positive train control do not justify the costs.

2.  Davis said the railroad has researched and tested the use of positive train separation systems but has found the technology needs more development.

3.  However, positive train separation uses more sophisticated computer technology that can predict and prevent potential train collisions.

4.  Positive train separation uses satellites to monitor train positions and is designed to prevent accidents caused by human error.

5.  The Brotherhood of Locomotive Engineers has argued for widespread use of positive train control.

6.  The positive train control experiment will include the automatic engine shutoff features.

7.  The report recommended that positive train separation be installed as a safeguard.

8.  With positive train separation, electronic systems can take control and stop one or both locomotives if they approach each other too closely.