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If you want to create a Two-way feeder service (en) then look there. The method described on this page works only in one way.
A feeder service is, put simply, one where vehicles perform a "relay" with the cargo. For example, a bus might pass passengers onto an out-of-town airport so that they can be flown across the map to gain more revenue.
In certain cases vehicles may appear to have a negative income even though they are important parts of a profitable chain.
Buses feeding an airport with passengers from a nearby town
For example, passengers arrive at the bus stop and a bus picks them up, the bus takes them to the local airport which is out of town and doesn't usually accept passengers. The bus is set to Transfer and leave empty at the airport and the passengers will leave the bus and wait for a plane to pick them up.
It does not always make sense to set up a point-to-point service for every possible route. Often, a hub based system makes more sense as it eases load on your network and enables passengers and cargo to use different types of transportation to move from A to B more efficiently. This is what the transfer button is for.
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How to set up a transfer route
So, imagine you have an airport in town and you wish to use a bus to bring passengers from the town centre to the airport. This can be easily accomplished:
First, the bus station must be built directly next to, as in touching, the airport. If there is a gap between the stations, the game will display a different name for the bus station, and transfer will not work.
This will not work due to the distance between the stations
Set up the route as normal, and select the Transfer button to tell the passengers to wait at the airport for a flight. To prevent the bus from stealing the plane's passengers, also select Unload. From OpenTTD 0.7.0 on, select No loading and Transfer from the dropdown menus. Now the order now reads Transfer and Leave Empty.
Correctly set up,the station now displays bus and plane symbols
This way, the bus always moves passengers to the airport for further transportation.
How to set up a more complex system
Complex feeder system. Buses bring passengers to an nearby train station. The shuttle train picks them up and transports them to the airport.
You might have noticed that (and wondered why) you can combine transfer with full load and unload (or no loading respectively). This can be used to set up more complex feeder services. Imagine you have that very same airport as in the example above. This airport has a number of Towns (en)s around it, and you'd like to have a shuttle train that goes through all the villages to collect passengers.
- The first village gets a normal (un-flagged) order, and thus a number of people board.
- In the second village, you want people to hop on, but no one to leave. So you set a transfer and take cargo order, which unloads passengers but subsequently reloads them, i.e.: Pick-Up only.
- All subsequent stops get the same order.
- The airport gets transfer and leave empty.
This way, all the people from all stops are dropped off at the airport and board their planes.
Another appealing aspect is to employ a local bus network in order to take passenger from all over town to a central train station. The transfer and take cargo is also useful if a vehicle is supposed to pick up cargo from several regional stations and then to deliver it to a destination far away, just like trains do in real life.
Speeding up a complex feeder service
From version 0.7.0 on, you can give your shuttle cars the No unload and take cargo order at all villages. This does the same like transfer and take cargo (see example above), but prevents the passengers from deboarding (i.e. transfer) and hopping on again. This makes the feeder service even faster and more realistic, because the train will only pick up the new passengers, while the passengers from the previous stations will remain in it.
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AIs that build feeder systems
- PAXLink uses local buses to feed its airports with passengers.