Train orders

openttd-srnw.org

@@ -107,3 +107,39 @@ train arrives. We do not place exit signals at the station. When a
 dummy train is inside the station it blocks the whole station due to
 the crossing tracks at the end of the station. The way-point is going
 to be used to open the station for the pick-up trains.
+
+* Train Orders
+** Dummy Trains
+We create a dummy train per station. These collect passengers and
+block the station for the pick-up trains. Once a full load of
+passengers has been collected the dummy train unloads them and
+unblocks the station. Now a full load of passengers is available for
+the pick-up trains.
+
+We make the trains length four so that it can drive around on the
+station itself which has length five. We are using "near end" and "far
+end" orders:
+
+1. Go to near end of the station and full load
+2. Go to far end of the station and transfer
+3. Go to the way-point after the station.
+
+Step three is what unblocks the station. Once the train has left the
+depot we have to remove the track right in front of it so that the
+dummy train can't re-enter the depot. Alternatively we could put the
+depot right after the way-point and delete it after the train left it.
+
+[[file:openttd-srnw/dummy-train-orders.png][file:openttd-srnw/dummy-train-orders-small.png]]
+
+** Pick-up Trains
+The pick-up trains have two orders:
+1. Go via INJECT way-point
+2. Go to transfer station and transfer.
+
+Unfortunately OpenTTD will create implicit orders every time the train
+passes through one of the SBahn stations. To prevent this we add a
+"Jump to order 1" instruction and then fill up the orders with an
+unreachable way-point. A train can only have 255 orders. Once the
+order list is full no implicit orders can be created.
+
+[[file:openttd-srnw/pick-up-train-orders.png][file:openttd-srnw/pick-up-train-orders-small.png]]