This typically cheap repair job seems to have once been access to the pedestrian bridge from the pathway down to the station.      There certainly was something here before!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/13232346@N00">Graham Richardson</a> from Plymouth, England
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/didbygraham/471749123/">Old way onto the pedestrian bridge</a>