Two large concrete cubes either side of the railway line into Chatham Dockyard, recessed to receive a transverse iron girder as an obstacle to enemy trying to use the railway. Unusual feature in an urban environment. 2 anti-vehicle obstacles (UORN 12577) and 1 rail obstacle both WW2.
Rail obstacle at entrance to railway at TQ 7757 6937. Road obstacle consists of 4 anti tank blocks on internal rd of the dockyard at TQ 7720 6958. (The SMR appears to have duplicated entries and reference s for these anti-tank obstacles - see Designation).