<p>This is GWR (Prairie) 2-6-2T locomotive No. 5521 built in 1927
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Here it has been specially painted in commemorative London Transport livery and numbered L.150
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/7587420@N07">Martin Stone</a> from Reading, United Kingdom
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/martinrstone/8855208363/">Met L.150</a>