In article . com,
TheOneKEA writes
I understand now. But it doesn't seem sensible to place the signals
that close together,

Signal spacing is chosen to meet various requirements, including maximum
throughput of trains. For example, on LU there are usually several
signals approaching a station, because this allows a train to draw up
close as the previous train departs. This is *better* than spacing the
signals further apart, but could mean that there are four or five red
signals behind a train under some circumstances.

or only hold one signal in rear of the signal
protecting an obstruction at danger.

Why? If one red signal can protect the obstruction, what's the need for
more?

--
Clive D.W. Feather | Home:
Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org
Fax: +44 870 051 9937 | Work:
Please reply to the Reply-To address, which is: