Three Bridges

Road, canal, and rail intersect at this point.

It proved difficult to find a vantage point to photograph, but this shot shows the road above and the rail line below the canal and footpath.

From the British Waterways sign nearby:
Long after the canal was built the Great Western and Brentford Railway proposed a line connecting Brentford Dock with the main line at Southall. They commissioned their foremost engineer, Isambard Kingdom Brunel, to survey where and how the railway should pass beneath the canal and Windmill Lane. He chose here, where the two crossed, and built the structure known as 'Three Bridges'. The canal now rests in a cast iron trough while a cast iron bridge carries the road above. Windmill Bridge was Brunel's last major undertaking and was completed in 1859.

See an aerial satellite map here.