I saw some strange lights this evening in the four foot of two of the four tracks on the MML. The tracks were next to each other on one side (the up slow and down slow I think). They were two lights or pairs of lights. A train ran on the furthest of the tracks, and didn't sound it's horn. There was no sign of anyone trackside, I didn't see anyone around in all orange, and what I think is the nearest access point was shut and locked, with no signs of anyone about.
What were they?
What were they?