Exactly what it says on the tin: a massive train made from bricks just on the outskirts of Darlington, or more precisely "situated next to Morrisons on Morton Park Industrial Estate" it's location is rather depressingly described on thisisdarlington.com tourist information website.
Interesting when you learn a little more about it though so here's a little about what they have to say:
The sculpture was built in 1997, designed by David Mach, to celebrate the rich railway heritage of Darlington. The adventurous can climb to the platform overlooking the train from above. The sculpture is signposted from surrounding roads (those'll be the brown tourist signs people!)