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Correct, ofcourse the mainline take priority and will have a longer bracket/Gantry on which the semaphore rests.
As regard to the single Distant, it depends on the length of the loop.
This website may help:
http://www.roscalen.com/signals/
The Thames Catamarans are great, much prefer using them over the Jubilee line after visiting the O2 or coming from London City Airport.
It may take a bit longer and bit more expensive but at least you can get a nice comfy seat, nice views and a coffee (even with the captive audience pricing).
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