CEO Kevin Meuret told the St. Louis Post-Dispatch that the hacking was probably committed by an ex-employee. “I’m a father of three daughters, and that young lady getting that [response] is horrible,” Meuret told the paper. “That young lady opened something that must have felt like a freight train, and that’s unacceptable.”
According to the previous context, the [response] is:
“Thank you for your interest in careers at Mantality Health. Unfortunately, we do not consider candidates that have suggestive ‘ghetto’ names. We wish you the best in your career search.”
I don't get the analogy: this letter --> something felt like a freight train. Maybe, it leverages the big and heavy nature of a freight train? I'm really not sure about it.
The full source.