Very little remains, as you suspected, despite UNESCO World Heritage Site listing. LOR remains include the tunnel entrance at Herculaneum Dock, several pillars embedded in the dock wall, a coach in the Liverpool Museum, and another one in poor condition but now in store having left Coventry. Of the MDHB system, various bits of track remain embedded in the cobbles or cross the dock road (subject to resurfacing). A few signal posts survive along with MDHB lamp posts. Several MDHB locos are in preservation and one is in the Liverpool Museum's store. A mainline rail route serves the container port but little remains of the extensive network of BR goods depots on the landward side of the dock road, except for tunnel portals. This is not a comprehensive list - I have probably missed out obvious items, the position changes rapidly with redevelopment, and I live 250 miles away! My personal view is that the major landowner has missed a great opportunity to keep more of the dock heritage within the redevelopment, to provide a 'sense of place' and distinct identity. There is very little to indicate the major importance of the area in the past, not even a 'heritage trail' with interpretation boards. Fortunately, more of the dock complex survives as part of the redeveloped Stanley Dock warehouse area (as well as the touristy Albert Dock area).