These are some maps of interest to Industrial Archaeologists:

From "Celebrating 100 years of The Drain 1998" showing line of Waterloo and City and other lines in the vicinity (including C&SLR under the Thames)

Original plans for City and South London Railway (large tif).

1959/60 general plans 1 & 2 of air-raid shelters in disused C&SLR tunnels at London Bridge.