Trains people to listen to voice recordings to determine who’s speaking or read e-mail and other writings known to be by a certain person and determine whether that person wrote the e-mail or letter in question.

They listen to voice recordings

Explanation:

The trains people listen to voice recordings. The voice recordings allow the trains people to make sure that the messages as they are transmitted during the course of the journey. The voice recordings allow the messages to be stored and archived for latter events, say in the events of an accident.

honestly you should not write it the word placement is not right and this does not sound right so i think you should write it this way. the life lessons i refused to learn, taught me the hard way this sounds way better you should try it! hope this is very !