Well I've never been to Borough station, but I might see if I can get anywhere with this little poser - I'm curious as to whether this is a unique thing combine wide, or specifically a Northern line job?
Assuming you can answer that without giving too much away tubeboy?
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It definitely had all the section 12 stuff when I worked there 9 years ago. The dome mentioned earlier is now unique to Kennington. Tubeboy, you have a PM. I'm probably completely wrong with my guess, but I think its a unique feature.