Recent works have much tidied the area and the departure of contractors' paraphernalia has revealed the top of the tunnel arch, to the west of Chamberlain Street bridge. This picture shows how depp the cutting is in which sits the platforms of Green Lane station.
<a href="//commons.wikimedia.org/wiki/User:Rodhullandemu" title="User:Rodhullandemu">Rodhullandemu</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>