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・Support canals
![Surprised :o](./images/smilies/icon_surprised.gif)
・Change transportation plan to an estimate basis
・The direction of the tracks on the double track was aligned as much as possible
・Performance improvement of ships
・Performance improvement of 1700s/1800s NewGRFs
・Performance improvement when infrastructure maintenance enabled
・Consider aerodynamic drag
・Consider station rating
・If AITown.GetLastMonthProduction() returns an abnormal value, ignore it
・Use AICargo.GetWeight() (openttd version 13 or higher)
・Add option: Freight only
・Add option: Disable prefixed station names
・FIX: AI stalled during pathfinding of freight
・FIX: A train not running on a 600mm Narrow Gauge
・FIX: Crash during converted rail
・Other minor bugs fix and adjustment