The television series 'Station 19' does not include any identifiable transsexual characters or storylines. Consequently, there is no portrayal of transsexual identity or related themes to evaluate within the show's narrative.

The show focuses on the professional and personal lives of firefighters. While female characters are frequently involved in physically demanding rescue operations and emergency responses, there are no clear instances of them engaging in and winning direct physical combat against male opponents through skill, strength, or martial arts.

Station 19 is an original drama series and a spin-off of Grey's Anatomy. Its characters were created for this series or its parent show, and there is no prior source material, historical record, or earlier adaptation where these specific characters existed with a different established gender. Therefore, no gender swaps occur.

Station 19 is an original series with characters created specifically for the show. There is no prior source material, historical record, or previous installment from which characters' races could have been established and subsequently changed.