Love on the Line by Deeanne Gist
Rural switchboard operator Georgie Gail is proud of her independence in a man's world.which makes it twice as vexing when the telephone company sends a man to look over her shoulder.
Dashing Luke Palmer is more than he appears though. He's a Texas Ranger working undercover to infiltrate a notorious gang of train robbers. Repairing telephones and tangling with this tempestuous woman is the last thing he wants to do. But when his stakeout puts Georgie in peril, he realizes more than his job is on the line.