A steam train on the London Underground

This is quite fabulous, though don’t stand too close if you don’t want to be baking hot on the Underground*:

(This was a test run to see if it would be feasible to run one or more stream trains as part of the 150th anniversary of the London Underground next year.)

* Fun fact: when it was originally built, the London Underground was a cool place to be on hot days but over the years the surrounding ground has absorbed so much more heat that it no longer is.