In message , Clive D. W. Feather
wrote:
Shepreth Branch Junction isn't a single lead junction, it's a double
lead junction. Completely different thing.

To clarify, there are three standard layouts for where a double track
splits (I've shown right-hand ones, but left-hand ones are equivalent):

(1) Double turnout:

----*-------
\
--*---X-----
\ \
\ \
\ \

Disadvantage: the diamond crossing is a derailment hazard at speed
unless you use switch diamonds, and has to be manufactured specially.

(2) Double lead:

----*--------
\
--*---*--*---
\ \
\--\ \
\ \

Disadvantage: requires space for three tracks for a short section, thus
needing more room overall.

(3) Single lead:

----*--------
\
--*---*--*---
\
*---\
\ \
\ \

Disadvantages: can't make parallel moves to and from the branch and
there are more layouts where a SPAD can result in a head-on collision.

--
Clive D.W. Feather | Home:
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