Travelling, especially a journey on the Trans- Siberian Express, inspired harpist Loreena McKennitt to write the music for her latest album.
In The Book of Secrets, McKennitt continues a process going back through her Celtic heritage, and using old influences to help her own creativity.
On the long train ride, the Canadian musician said, she found the peace and quiet needed to prepare for The Book of Secrets.
A feeling of motion runs through the songs.
Many of the tunes seem driven by movement and change, including the thundering horses' hooves of Night Ride Across the Caucasus.
The soul-mates in Dante's Prayer and the dramatic cast of McKennitt's interpretation of the poem The Highwayman also feel restless.
Before she began breathing life into long-forgotten lyrics, McKennitt first made her name as a singer of traditional folk ballads.