Some app routes that may be of interest to developers:

• /map/<game_title> - renders the given game's map
• /tiles/all - renders all of the track tiles (and generic map hex "tiles") defined in lib/engine/tile.rb
• /tiles/<tile_name> - renders a single tile at large scale (tile must be defined in lib/engine/tile.rb)
• /tiles/<game_title>/<hex_coord_or_tile_name> - renders a single hex or tile the given game at large scale. Multiple hex coords or tile names can be given, separated by +.
• /tiles/<game_titles>/all - renders all of the track tiles (and map hex "tiles") for the given games (multiple game titles can be given, separated by +). The game titles are fuzzy matched.

Optional URL params for above routes:

• r=<rotation(s)> - specify the rotation with an Integer, multiple rotations with +-separated Integers, or all to see all 6. Preprinted tiles are not rotated. This param is ignored at /tiles/all.
• n=<location_name> - specify a location name to render for tiles that have at least one stop. Preprinted tiles with location names are not overridden. This param is ignored at /tiles/all.
• grid - show the triangular grid on the hexes to identify regions on the tile
• Rotation can be specified in <tile_name> by adding it after a -, e.g., /tiles/9-1 renders tile #9 with rotation 1, and /tiles/7-2+8-2 renders tiles 7 and 8 both with rotation 2. Tiles that have rotation specified in this way ignore the r= param.

Main parts are separated by ;. Sub parts are separated by ,. If a sub part takes a list of properties, those properties are separated by |.

Some parts of a tile are not defined in this string but at other parts of the game config/code:

• color
• location name(s)
• city slots reserved for corporations/companies (e.g., home token locations)
• company "blockers" that prevent tile lays in the hex

• city
  • slots - integer - how many tokens can fit in this city (default: 1)
• town
• offboard - this revenue center is not actually rendered, but changes how the track to it is rendered; track to offboards are pointed
• path
  • a and b - required - the two points connected by this path; can be integer to indicate edge number, or an underscore followed by an integer to refer by index to a city/town/offboard/junction defined earlier on the tile
  • terminal - 1 - indicates that path is part of a non-passthru path, typically for off-board cities. Tapered track will be drawn. If a 2 is used instead, the tapered track will be drawn much shorter.
  • ignore - 1 - indicates that path should be ignored when node walk is trying to map available paths and hexes.
  • a_lane - integer.integer - first integer specifies the lane width for the a path endpoint, the second integer specifies the lane index, or position within the lane. 0 is the most clockwise position.
  • b_lane - integer.integer - first integer specifies the lane width for the b path endpoint, the second integer specifies the lane index, or position within the lane. 0 is the most clockwise position.
  • lanes - integer - number of parallel paths. Creates multiple copies of this path with a_lane and b_lane for each path generated automatically and set rationally.
  • track - broad/narrow/dual - used for display and connectivity. Defaults to broad.
• label - large letter(s) on tile (e.g., "Chi", "OO", or "Z")
• upgrade
  • cost - required - integer
  • terrain - mountain/water - multiple terrain types separated by |
  • loc - (currently only supported for :pointy layouts) corner to render the upgrade in, 5.5 to be where edges 5 and 0 meet, 0.5 for edges 0 and 1, and so on
• border
  • edge - required - integer - which edge to modify
  • type - mountain/water/impassable - Border type. If not' specified, a line matching the tile's color is drawn on top of the edge's normal black line so that two adjacent tiles appear joined.
  • cost - integer - cost to cross for mountain/water borders
• junction - the center point of a Lawson-style tile
• icon
  • image - required - name of image, will be rendered with file at public/icons/#{image}.svg
  • name - name of this icon; default is value given for image
  • sticky - 1 indicates the icon should remain visible when a tile upgrade is placed on this hex
  • blocks_lay - indicates this tile cannot be laid normally but can only be laid by special ability, such as a private company's ability.
  • loc - (currently only supported for :pointy layouts) corner to render the upgrade in, 5.5 to be where edges 5 and 0 meet, 0.5 for edges 0 and 1, and so on
• frame
  • color - required - the color of the frame
  • color2 - A second color to display on the frame

Towns, cities, and offboards have a few "sub parts" in common:

• revenue - required - single integer, or revenues for different phases (separated by "|")
  • phase based revenue has the phase and revenue separated by an underscore, e.g., yellow_40
• groups - strings separated by |; routes cannot contain more than one revenue center from a group, e.g., "East" is a group in 1846 as routes cannot run E-E
• hide - 1 indicates that the revenue for this revenue center should not be rendered

• style
  • rect (rectangle) - default when 1 or 2 paths connect to the town
  • dot - default when 0 or 3+ paths connect to the town
  • hidden - don't show at all, useful for special offboards that count as towns instead of cities; construct with a hidden town and terminal paths

Lanes are used to specify paths for tiles that have double-track, treble-track and quad-track. Every path endpoint (a and b) has two lane attributes associated with it: width and index. The width specifies the number of tracks that connect to a given edge. The index specifies the position of that particular path within those tracks. Typically, only the lanes sub part for a path needs to be given. That will automatically create n "parallel" paths between the edges or nodes specified on the path. The only time a_lane or b_lane need to be given is if the endpoints need to be connected in an unusual way (for instance going from a double-track edge to a single-track edge).

• tile #1

town=revenue:10;town=revenue:10;path=a:1,b:_0;path=a:_0,b:3;path=a:0,b:_1;path=a:_1,b:4

• tile #23

path=a:0,b:3;path=a:0,b:4

• Lawson tile #81

junction;path=a:0,b:_0;path=a:2,b:_0;path=a:4,b:_0

• 1889 - tile 439

city=revenue:60,slots:2;path=a:0,b:_0;path=a:2,b:_0;path=a:4,b:_0;label=H;upgrade=cost:80

• 1889 - preprinted tile for H5

upgrade=cost:80,terrain:water|mountain

• 18Chesapeake - preprinted tiles for A3 and B2
  • A3 - city=revenue:yellow_40|green_50|brown_60|gray_80,hide:1,groups:Pittsburgh;path=a:5,b:_0;border=edge:4
  • B2 - offboard=revenue:yellow_40|green_50|brown_60|gray_80,groups:Pittsburgh;path=a:0,b:_0;border=edge:1

• 18Chesapeake - preprinted tile for H6

city=revenue:30;city=revenue:30;path=a:1,b:_0;path=a:4,b:_1;label=OO;upgrade=cost:40,terrain:water

• 18Chesapeake - preprinted tile for K3

town=revenue:0;town=revenue:0

• 18MEX - Upgrade for Mexico City

city=revenue:60,slots:3,loc:center;town=revenue:10,loc:2;path=a:0,b:_0;path=a:1,b:_0;path=a:3,b:_0;path=a:2,b:_1;path=a:5,b:_0,lanes:2;path=a:_1,b:_0;label=MC

• 18MEX - Upgrade for Puebla

town=revenue:10;path=a:2,b:_0,a_lane:2.1;path=a:5,b:_0;path=a:2,b:4,a_lane:2.0;label=P

• 1831 - tile 301c (title not implemented)

path=a:0,b:3,lanes:3