Big Big Train: Empire on 2 CDs and 1 Blu-ray Disc

Conventional CD, playable with all CD players and computer drives, but also with most SACD or multiplayers.

The Blu-Ray was developed as a high-definition successor to the DVD and offers a significantly increased data rate and storage capacity compared to its predecessor. Blu-Rays can therefore store movies with significantly better resolution and offer enormously high picture quality on corresponding screens. Blu-Ray players are usually backward compatible with DVDs, so that they can also be played.