I think I was 23 last and first time I saw Starlight Express from Andrew Lloyd Webber, so it was a little while ago, back somewhere in the center of London (the revival is by wembley stadium, somewhat outside). It was a fun and engaging musical, which I already knew by heart thanks to my dad who had the official recording had played it at home many times.
Just like most everything from Andrew Lloyd Webber, the music is very engaging and although the storyline is really just about a race between trains of different propulsion, it's done wonderfully :)
I didn't know it was an updated version of the musical, but overall it kept enough of the original, and the added bits about hydrogen were entertaining.
They nicely allowed us to take pictures and videos at the end of the show: