Review from musicaldiscoveries.com/reviews/soat.htm

The Key pt. II: The Labyrinth
First released in 1993, Stranger On A Train's second album The Key Part 2: The Labyrinth (Verglas (UK) VGCD013, 1998) builds upon Part 1's themes. This second of a planned three-album series is truly a masterwork and one of the finest symphonic progressive albums of all time. It must be listened to. 
Written by Clive Nolan (keyboards), the group also comprises Tracy Hitchings (vocals), Karl Groom (guitars, bass, drum programming [new in Part 2]) and Alan Reed (vocals). The album is more heavily orchestrated than the first with additional intrumental layers.
The group's soundtrack-like style is taken to a higher level and complimenting male vocals further emphasise the show-like quality of the music. The five-part, 72-minute recording has three truly epic-length, multi-movement tracks ("Darkworld," "The Labyrinth," "Endzone") and two shorter tracks ("Hijrah," "The Vision Clears") with a balance of instrumental and vocal work.
The opening instrumental movement of the epic "Darkworld" duet quickly reveals the depth of the orchestration within The Labyrinth album. Tracy Hitchings performs a stunning first vocal part in 'Edge Of Darkness.' 'Deliverance' follows with Alan Reed's vocals and develops into a lovely intertwined duet with Tracy. Her solo 'A Moment Of Sanity' follows with soaring electric guitar. The track then builds to a crescendo with the stunning and instrumentally rich Hitchings / Reed duet 'Beyond The Rubicon.'
Tracy's scat carries a lovely melody in the instrumentally rich "Hurjah" with both backing and harp-like keyboards before a fast-paced, almost ragtime, piano part takes over. This leads to a heavily orchestrated, instrumentally rich, passage laced with extensive instrumentation and soaring (similar to Wakeman/Emerson-style) keyboard work. The feeling of mechanical transport clearly emerges before the track comes to a close.
The orchestration further develops with a strong string theme in the introduction to the title track before the acoustic guitar takes over and Tracy's lead vocals begins. While other tracks illustrate her power and range, this track shows her incredible ability to sustain. The opening movement to "The Labyrinth", contains one of several highly memorable melodies found on this album. The title track concludes with a narrative second part and a heavy instrumental third part, both underscoring the mechanical motion, train-like, soundtrack theme.
Certainly the most memorable 'single-like' track is the absolutely stunning "The Vision Clears." While progressively orchestrated, with it's almost hook-based chorus, this song has the feeling of what we'd imagine a Tracy Hitchings solo number to sound like -- almost like a torch ballad -- and it would be equally at home in several genres. The guitar-led instrumental bridge, however, plants the song clearly in its progressive home.
A lovely keyboard-based introductory movement and second Alan Reed vocal part called 'Purification' open the final epic 'Endzone.' A third, spacy, choral-like keyboard movement called 'Recovery' follows before the fourth movement, 'The New Perspective,' begins. In a lighter style, this track is emotionally wrought and theatrically sung over light piano with lovely acoustic guitar parts between the sung portions. Powerful and sweet multi-tracked vocals join richly produced keyboards to conclude the movement. 
'Denoument' begins with light instrumentation and Alan Reed's vocals. Themes developed earlier (Part I: "Arrival," "The Key," Part II: "Darkworld") are then drawn together as Tracy's vocals join in to form a fabulous complimentary duet prior to an explosive guitar-laced instrumental that concludes the album.
Conclusion;
The two Strangers On A Train albums work extremely well together with the second building upon the strengths of the first and reaching new heights orchestrally. The duets further underscore the timeless show-like soundtrack quality the band presents in their music. The Verglas reissues are timely and well-produced with attractive artwork. The booklets include complete lyrics and other recording details enthusiasts will appreciate. These are two very fine CDs: "must-haves" for serious lovers of symphonic progressive rock music featuring female vocals. The third album in the trilogy -- The Key Part III: The Legacy -- should be recorded in 1999 and emerge in 2000.