Great Western Railway's high speed train 43029 is a rare visitor to London's Marylebone station. Engineering work at nearby London Paddington station over Christmas 2015 has forced this diversion. It will have to run down the Chiltern Main Line to Bicester where it will reverse and head south through Oxford then around the West Curve at Didcot before it can pick up its usual route to Swansea.
<a href="//commons.wikimedia.org/wiki/User:Geof_Sheppard" title="User:Geof Sheppard">Geof Sheppard</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>