Negotiations with the GER for the works under Liverpool Street station were unsuccessful, and the final section beyond Bank was only constructed for a short distance as sidings. To minimise the risk of subsidence, the routing of the tunnels followed the roads on the surface and avoided passing under buildings. Usually the tunnels were bored side by side below the surface, but where a road was too narrow to allow this, the tunnels were aligned one above the other, so that a number of stations have platforms at different levels. To assist with the deceleration of trains arriving at stations and the acceleration of trains leaving, station tunnels were located at the tops of slight inclines.