Black and White or Colour?

Sometimes I take a picture and it truly amazes me. Compositionally, this image is a bit flawed as it was a grab shot but the most interesting thing of it is the colour, or lack of it.

This photo is in colour but looks like a sepia toned black and white image. The colour is essentially that out of the camera and it was just a brief moment in time after sunrise where this 'monochromatic' shot came into being...

Taken with an Olympus E-P3 and Olympus 45mm f/1.8 lens.