Ginga Tetsudou Monogatari: Wasurerareta Toki no Wakusei
English name: The Galaxy Railways: A Letter from the Abandoned Planet
Genres: Drama, Sci-Fi
Type: OVA, Episodes: 4
Aired: Dec 30, 2006 to Apr 25, 2007
Studio: Planet
Source: Original
Rating: PG-13 - Teens 13 or older
Synopsis:
This is the OVA of The Galaxy Railways.

The Galaxy Express 999 crashes on the off-limits planet of Herise and it's up to the SDF Sirius Platoon to assist. 

(Source: Wikipedia)