Roland Perry wrote:
In message
-septe
mber.org, at 22:13:51 on Fri, 24 Mar 2017, Recliner
remarked:

Unlike the Gatwick shuttle, there are points, so trains can switch track,
and the number of trains isnt limited to two.

In both cases like the shuttle at Stansted, or thinking back a long way
the inter-terminal shuttle at DFW back in the 80's. May be still there.

No, the Gatwick shuttle is different: it's simply two unconnected shuttle
lines, with no switches or crossovers. Each line has its own train that
simply shuttles backwards and forwards, so there are a maximum of two
trains. In Stansted, there are separate up and down lines, and the number
of trains isn't limited by the layout. The Heathrow T5 system can work in
either mode.