Long-lost World War Two tank traps known as "dragon's teeth" were revealed during bridge repair works.
The objects – which are big pyramids of concrete – date from the early years of the war when fears of a Nazi invasion were very real.
They are positioned in such a way as to block the route up the embankment to the railway line.
The tank traps were rescued from the undergrowth near Stalbridge Avenue in Mossley Hill, where Network Rail is carrying out bridge work.
Now nearby residents, led by Helen O'Gorman, are hoping more information can be uncovered about the objects – thought to date from 1940 – so a plaque can be placed there.
Helen said: "Network Rail, persuaded by local residents, have agreed to put up a plaque to commemorate the work of the Home Guard in manning them and we wanted to find information to make this as accurate as possible.
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"For instance which Royal Engineers Unit or commercial company would have put them there and which Home Guard Unit – possibly the 91st Battalion, which was made up of railway employees – might have manned them.
"We have tried social media groups but though people have been very interested and have a lot of broad general information they can't give us specifics for the plaque.
"We have tried loads of other websites and specialists too."
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