Adds link to #speed description

Author: Chris Jakeman

Source/Documentation/Manual/operation.rst

@@ -614,7 +614,7 @@ AE in the .srv file as "Efficiency".
 
 If the AI train makes station stops, its maxspeed depends from the "Performance" 
 parameter for every route section, as can be seen and defined in the AI train 
-timetable (that is maxspeed is the product of the first MAxVelocity parameter by 
+timetable (that is maxspeed is the product of the first MaxVelocity parameter by 
 the "Performance" parameter divided by 100).
 
 Such performance parameter list is written (divided by 100) by the AE in 
@@ -632,6 +632,8 @@ This corresponds to MSTS behaviour.
 Moreover the Efficiency parameter is used also to compute acceleration and 
 braking curves.
 
+.. _operation-speed:
+
 Calculation of Train Speed Limit
 --------------------------------
 

Source/Documentation/Manual/timetable.rst

@@ -428,6 +428,8 @@ Special Rows
   The #dispose row presently does not affect the end of the run for the player 
   train.
 
+.. _timetable-train-speed:
+
 - ``#speed`` row
 
   This optional field defines maximum speed for trains, which may restrict the 
@@ -438,7 +440,7 @@ Special Rows
   If specified, only one ``#speed`` (m/s), ``#speedkph``, or ``#speedmph`` row 
   can be present in a single timetable file.
 
-  This row also accepts a number of :ref:`speed commands <timetable-speed>`.
+  This row also accepts a number of :ref:`speed commands <timetable-cmd-speed>`.
 
 - ``#restartdelay`` row
 
@@ -514,7 +516,7 @@ Gradient
     Syntax    
         ``$gradient /perc=n /speed=s``
 
-        The gradient command must be set in a ``#speed`` field of a train.
+        The gradient command must be set in the ``#speed`` :ref:`field of a train <timetable-train-speed>`.        
 
     Functionality    
         When gradient is set, forced acceleration is turned off if the leading engine of the train is on a 
@@ -1395,7 +1397,7 @@ A typical value for modern stock for the ``$dec`` command is 2 or 3.
     clear of the reverse position. This is useful when shunting in yards when 
     there is no need to fully exit the yard to reverse and the entry signal.
 
-.. _timetable-speed:
+.. _timetable-cmd-speed:
 
 Speed Commands
 ''''''''''''''