In article , Tom
Anderson writes
The discussion says that something called a '4-track relay terminal
with a 2-track relay' used to exist at Park Row on the New York subway.
No idea what that is, but the poster seemed to be impressed.

I asked a knowledgeable friend.

Firstly, it wasn't on the Subway but on the erstwhile Brooklyn Bridge
Railway, at the Manhattan end. Turning it into UK terms, the layout
would be:

####D####
/--------------\
|------* ####A#### \
\-----------\ /--*----
X
/-----------/ \--*----
|------* ####D#### /
\--------------/
####A####

The platforms marked D were for departing passengers and A for arriving
ones. The X is a simple diamond crossing without slips.

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