Editing v0.34:Wagon

{{quality|Exceptional|18:27, 28 April 2011 (UTC)}}
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''(For information on the wagon carrying your goods during embark, see [[Wagon (embark)]].)''
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[[Image:Depot alley.png|thumb|right|A depot in the fortress, with a narrow, trapped accessway.]]
[[Image:Depot accessible.png|thumb|right|Composite image of depot access screen.  Strategically arranged walls and natural obstacles (boulders) force wagons to enter and exit the map immediately to the east of the depot.]]

'''Wagons''' are special creatures used by [[caravan]]s. Both [[Human]]s and [[Dwarf|dwarves]] are meant to send wagons with their caravans, which have a much greater capacity for bringing foreign imports and accepting dwarven exports.  Unfortunately, wagons require paths that are three tiles wide to pass.  If wagons are unable to find an open path to your trade depot (or if you have not built a depot at all), they will bypass your site and you will only be able to trade for what is available on the pack animals. 

Wagons '''cannot''' cross [[door]]s (even if the doors span an area ordinarily wide enough for the wagon to pass) or upward or downward [[stair]]s, though wagons can move across downward stairs covered by a [[hatch cover]].  Obstructing [[boulder]]s must be smoothed ( {{K|d}} - {{K|s}} ), and [[tree]]s must be cut down ( {{K|d}} - {{K|t}} ).  [[Shrub]]s do not obstruct wagons, and neither do [[ramp]]s, [[bridge]]s, [[road]]s, or [[floor]] tiles. (However, ramps covered by a [[Hatch cover|hatch]] do obstruct.)  The impassable tiles of [[workshop]]s and other buildings will obstruct, but the passable tiles of those buildings will not.  Any buildings which are normally passable, including [[restraint]]s and [[trap]]s, will not obstruct wagons either, nor will creatures, whether restrained or free.  ('''Note:''' [[Trap]]s and [[pressure plate]]s are no longer passable for wagons as of v0.34.08 {{Bug|5927}}.) A drained [[murky pool]] tile will block trade depot access. Paving over the tile then removing the road/floor will remove the 'Murky Pool' tag and allow wagons to cross it.

To keep trees from growing and blocking a path, you should build roads, bridges, or floor tiles over any [[soil]] tiles that make up part of the path.  Ramps must be used to adjust [[z-level]] elevation.

After a trade depot is built, you can use {{K|D}} to check wagon accessibility. The decisive element is that you see the 'depot accessible' message on the right. Accessibility is calculated from your depot, not the edge of the map. Even though you see a green area around your depot, it may not be accessible. You need to make sure the path extends all the way to some edge of the map. The display is somewhat misleading in that a one tile wide green path is sufficient for the 3 tile wide wagons; the green {{Raw Tile|W|2:2:1}}s represent only the ''center'' of a wagon although the whole 3x3 can fit around it - so a three-tile wide path, which can fit a wagon, will only show up as one-tile wide line of {{Raw Tile|W|2:2:1}}s.  When the route they would take goes over hills (ramps), it's hard to eye whether it is continuous all the way to the edge of the map, so be sure you see the words "depot accessible" on the depot access screen.

As long as you have a three-tile wide path to the depot that reaches ''any'' edge of the map, wagons will be able to reach the depot.  If there is only one path they can take, they will take that path.  You can force them to enter and exit the map in an exact spot -- preferably very near your depot -- by erecting walls or digging channels so that all paths but the one you want them to take are blocked. Note that caravans will always prefer to enter the map at a wagon-accessible point if one exists, so this can also be used for Elven caravans as well.

Note that wagons use different rules for movement on ramps - namely, they are able to ascend a ramp to a raised floor over empty space, but cannot cross the line of ramps while remaining at the same level.  With some careful design it is possible to make bridges that control depot accessibility without actually allowing anything to cross them, or paths that can be traversed only by wagons but not dwarves or ''vice versa''.

==Bugs==
*It's possible for a dwarf to have a preference for "wagon wood".{{Bug|3676}}

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 {{quality|Exceptional|18:27, 28 April 2011 (UTC)}}
-{{creaturelookup/0|contrib=no|death=item|item=Wagon wood|wiki=yes}}
+{{creaturelookup/0|contrib=no}}
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-{{buggy}}
 ''(For information on the wagon carrying your goods during embark, see [[Wagon (embark)]].)''
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 {{creaturedesc}}
-<!--
-Traps currently block wagons -- hiding these screenshots which suggest otherwise
 [[Image:Depot alley.png|thumb|right|A depot in the fortress, with a narrow, trapped accessway.]]
 [[Image:Depot accessible.png|thumb|right|Composite image of depot access screen.  Strategically arranged walls and natural obstacles (boulders) force wagons to enter and exit the map immediately to the east of the depot.]]
--->
-'''Wagons''' are special "creatures" used by [[Human]] and [[Dwarf|Dwarven]] [[caravan]]s. Wagons have a much greater hauling capacity than pack animals, increasing the imported goods available to your fortress and the capacity for exported goods.  Unfortunately, wagons require specific accommodations to reach your fortress: wagon-accessible paths must be three tiles wide, extend from natural-land tiles at the screen border to your [[trade depot]], and cannot contain [[trap]]s or [[pressure plate]]s.  If wagons are unable to find a path to your trade depot (or if you have not built a depot at all), they will bypass your site and you will only be able to trade for what is available on the merchants' pack animals.
-Wagons '''cannot''' move through [[trap]]s, [[pressure plate]]s, [[door]]s (even if the doors span an area ordinarily wide enough for the wagon to pass) or cross upward or downward [[stair]]s, though wagons can move across downward stairs covered by a (closed) [[hatch cover]].  Obstructing [[boulder]]s must be smoothed ( {{K|d}} - {{K|s}} ), and [[tree]]s must be cut down ( {{K|d}} - {{K|t}} ).  [[Shrub]]s do not obstruct wagons, and neither do [[ramp]]s, [[bridge]]s, [[road]]s, or [[floor]] tiles. (However, ramps covered by a [[Hatch cover|hatch]] do obstruct.)  The impassable tiles of [[workshop]]s and other buildings will obstruct, but the passable tiles of those buildings will not.  Any other buildings which are normally passable, including [[restraint]]s, will not obstruct wagons either, nor will creatures (except other wagons). A drained [[murky pool]] tile will block trade depot access; paving over the tile  (and optionally removing the road/floor) will allow wagons to cross it. To keep trees and boulders from growing and blocking a path, you should build roads, bridges, or floor tiles over any [[soil]] tiles that make up part of the path.
-Ramps can be used by wagons to adjust [[z-level]] elevation. Note that wagons use different rules for movement on ramps - namely, they are able to ascend a ramp to a raised floor over empty space, but cannot cross the line of ramps while remaining at the same level.  With some careful design it is possible to make bridges that control depot accessibility without actually allowing anything to cross them, or paths that can be traversed only by wagons but not dwarves or ''vice versa''.
-After a trade depot is built, you can use {{K|D}} to check wagon accessibility. The decisive element is that you see the 'depot accessible' message on the right. Accessibility is calculated from your depot towards the map edges; even though you see a green area around your depot, it may not be accessible from outside. You need to make sure the path extends all the way to some edge of the map. The display is somewhat misleading in that a one tile wide green path is sufficient for the 3 tile wide wagons; the green {{Raw Tile|W|2:2:1}}s represent only the ''center'' of a wagon although the whole 3x3 can fit around it - so a three-tile wide path, which can fit a wagon, will only show up as one-tile wide line of {{Raw Tile|W|2:2:1}}s.  When the route they would take goes over hills (ramps), it's hard to eye whether it is continuous all the way to the edge of the map, so be sure you see the words "depot accessible" on the depot access screen.
-As long as you have a three-tile wide path to the depot that reaches ''any'' natural-land tiles at the edge of the map, wagons will be able to reach the depot.  If there is only one path they can take, they will take that path.  You can force them to enter and exit the map in an exact spot -- preferably very near your depot -- by erecting walls or digging channels so that all paths but the one you want them to take are blocked. Note that all caravans will prefer to enter the map at a wagon-accessible point, so this can also be used for [[Elf|Elven]] caravans as well.
+'''Wagons''' are special creatures used by [[caravan]]s. Both [[Human]]s and [[Dwarf|dwarves]] are meant to send wagons with their caravans, which have a much greater capacity for bringing foreign imports and accepting dwarven exports.  Unfortunately, wagons require paths that are three tiles wide to pass.  If wagons are unable to find an open path to your trade depot (or if you have not built a depot at all), they will bypass your site and you will only be able to trade for what is available on the pack animals.
-Wagons will not appear on non-natural surface tiles at a map edge (such as a "bridge to nowhere"), though they can sometimes be encouraged to leave the map edge in such a manner. Wagons will also delay appearing at the map edge if their intended location is currently blocked by any other creature.
+Wagons '''cannot''' cross [[door]]s (even if the doors span an area ordinarily wide enough for the wagon to pass) or upward or downward [[stair]]s, though wagons can move across downward stairs covered by a [[hatch cover]].  Obstructing [[boulder]]s must be smoothed ( {{K|d}} - {{K|s}} ), and [[tree]]s must be cut down ( {{K|d}} - {{K|t}} ).  [[Shrub]]s do not obstruct wagons, and neither do [[ramp]]s, [[bridge]]s, [[road]]s, or [[floor]] tiles. (However, ramps covered by a [[Hatch cover|hatch]] do obstruct.)  The impassable tiles of [[workshop]]s and other buildings will obstruct, but the passable tiles of those buildings will not.  Any buildings which are normally passable, including [[restraint]]s and [[trap]]s, will not obstruct wagons either, nor will creatures, whether restrained or free.  ('''Note:''' [[Trap]]s and [[pressure plate]]s are no longer passable for wagons as of v0.34.08 {{Bug|5927}}.) A drained [[murky pool]] tile will block trade depot access. Paving over the tile then removing the road/floor will remove the 'Murky Pool' tag and allow wagons to cross it.
-Wagons which are destroyed, abandoned, or scuttled will leave behind a unique type of wood: wagon wood. Since they count as creatures, dead wagons can be [[memorial]]ized (though a [[ghost]]ly wagon has not yet been observed).{{cite talk/this|Wagon death, list in deceased list and memorialization bug reproduction}}
+To keep trees from growing and blocking a path, you should build roads, bridges, or floor tiles over any [[soil]] tiles that make up part of the path.  Ramps must be used to adjust [[z-level]] elevation.
-==Wagon-only entrances==
+After a trade depot is built, you can use {{K|D}} to check wagon accessibility. The decisive element is that you see the 'depot accessible' message on the right. Accessibility is calculated from your depot, not the edge of the map. Even though you see a green area around your depot, it may not be accessible. You need to make sure the path extends all the way to some edge of the map. The display is somewhat misleading in that a one tile wide green path is sufficient for the 3 tile wide wagons; the green {{Raw Tile|W|2:2:1}}s represent only the ''center'' of a wagon although the whole 3x3 can fit around it - so a three-tile wide path, which can fit a wagon, will only show up as one-tile wide line of {{Raw Tile|W|2:2:1}}s.  When the route they would take goes over hills (ramps), it's hard to eye whether it is continuous all the way to the edge of the map, so be sure you see the words "depot accessible" on the depot access screen.
-Wagons are able to navigate through certain entrances which other (walking) creatures cannot.  Specificially, wagons can climb ramps that walking creatures consider to be "unusuable".  By building a set of ramps which are exclusively unusable, you can send wagons on a direct route, while filtering all other traffic through your trap-covered route.
-An example: [http://www.bay12forums.com/smf/index.php?topic=125977.0]:
+As long as you have a three-tile wide path to the depot that reaches ''any'' edge of the map, wagons will be able to reach the depot.  If there is only one path they can take, they will take that path.  You can force them to enter and exit the map in an exact spot -- preferably very near your depot -- by erecting walls or digging channels so that all paths but the one you want them to take are blocked. Note that caravans will always prefer to enter the map at a wagon-accessible point if one exists, so this can also be used for Elven caravans as well.
-{{diagram|spaces=yes|\
-[#0ff]Z[#0ff]{{=}}[#0ff]0    [#0ff]Z[#0ff]{{=}}[#0ff]1
-▓+++▓  ▓▓▓▓▓
-▓▲▲▲▓  ▓▼▼▼▓
-▓+++▓  ▓+++▓
-▓▓▓▓▓  ▓+++▓
-▓+++▓  ▓+++▓
-▓▲▲▲▓  ▓▼▼▼▓
-▓+++▓  ▓▓▓▓▓
-}}
-Another example, which uses slightly less space.
+Note that wagons use different rules for movement on ramps - namely, they are able to ascend a ramp to a raised floor over empty space, but cannot cross the line of ramps while remaining at the same level.  With some careful design it is possible to make bridges that control depot accessibility without actually allowing anything to cross them, or paths that can be traversed only by wagons but not dwarves or ''vice versa''.
-{{diagram|spaces=yes|\
-[#0ff]Z[#0ff]{{=}}[#0ff]-[#0ff]1   [#0ff]Z[#0ff]{{=}}[#0ff]0
-▓▓▓▓▓  ▓+++▓
-▓+++▓  ▓+++▓
-▓▲▲▲▓  ▓▼▼▼▓
-▓+++▓  ▓+++▓
-▓▓▓▓▓  ▓+++▓
-}}
 ==Bugs==
-*Wagons can become "stuck" in obstacles.{{bug|5418}}
-*Wagon pathing problems can result in caravan collisions.{{bug|5687}}
 *It's possible for a dwarf to have a preference for "wagon wood".{{Bug|3676}}
-*It is possible for a wagon to be listed as "deceased" after removing it.
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