According to Neowing, the DVD & Blu-ray volume 1 of Senkou no Night Raid
will include an extra episode "Episode 0: Senjyo no Crank Up (Wrapping Up on Board)". The director's cut edition of the episode 1 will have 3 min long additional scenes. Japanese dubs will be available on the secondary sound channel in the Chinese part.
The DVD & Blu-ray will be released on June 23rd.
Updated on June 22nd
According to the official website, the DVD & Blu-ray volume 4 will include an unaired episode "Ahenkutsu no Akuma (Devil in the Opium den)". It will be released on September 22nd.
Source: Night Rail official website