With a gazillion locomotives on the DLS, there's no way of knowing exactly what it is without providing us with a kuid. The kuid is the ID number and includes two main parts: <kuid:User-ID:Asset-ID>. The newer version is <kuids2:User-ID:Asset-ID:version>
There is the web-DLS, provided by the link above. While you can't download from there directly, meaning you need to use an FTP Client, you can browse there and may find the locomotive you are looking for.