5L49 ended up being duplicated at Cambridge tonight as at 20:02, 5L49 [Hornsey E.M.U.D. to Norwich Cpt.] was passing through. Meanwhile 5L49 [Cambridge - Cambridge T&R.S.M.D.] was departing into the depot after coming off of 1L49 [Birmingham - Cambridge]. What are the repercussions of this mishap, if it is even considered a mishap. Of course I have full faith that the signaller on the PSB took extra care to not accidentally send a Cross Country 170 to Norwich, but someone behind the scenes must be red in the face surely?