Add information on short routes

1 files changed, 16 insertions, 0 deletions

diff --git a/assets/manual/manual.tex b/assets/manual/manual.tex
index b15a219..155c546 100644
--- a/assets/manual/manual.tex
+++ b/assets/manual/manual.tex
@@ -809,6 +809,22 @@ With single-track sections, routes should generally be set up in a way that the
 
 Notice that the deadlock is prevented at the cost of lower capacity of the line.
 
+\subsubsection{Short routes}
+In some cases, there may be setups with very short routes:
+
+\begin{centeredtikzpicture}
+  \draw [->] (0,0) -- (4.5,0);
+  \draw [very thick, blue, ->] (0.5,0) -- (1.5,0);
+  \pic at (2,0) [xscale=-1] {signal=green};
+  \node [below] at (2,0) {$P$};
+  \pic at (4,0) [xscale=-1] {signal=green};
+  \node [below] at (4,0) {$Q$};
+\end{centeredtikzpicture}
+
+In the setup illustrated above, if $\overline{PQ}$ is short enough, or, more specifically, if $\overline{PQ}$ is shorter than the braking distance of the train at $P$, the signal at $Q$ will be triggered to set a route.
+
+If short routes are desired, such as at stations, it is generally recommended to disable ARS for the train, such as by using the \texttt{A0} ATC command, and keep some distance between the influence point of the signal and the point at which the train is expected to stop. Alternatively, you can also limit the speed of the train to trigger the routesetting system later, but this is not the ideal solution in most use cases of short routes.
+
 \subsection{Basic three-station setup}\label{s:ilbasicsetup}
 Now that you have learned to use interlocking, create a simple three-station setup shown below.
 \begin{centeredtikzpicture}[scale=0.6]