🚂 Train 火車

What it does 做乜嘢

Three outbound wagons wanting goods, returning building materials — planks, bricks, nails, glass, slabs, paint, screws — on a twenty-to-sixty-minute round trip. 三個出發車卡要貨，用 20 到 60 分鐘一個來回，換返建築材料——木板、磚頭、釘、玻璃、石板、油漆、螺絲。

How it works 點運作

Materials are the only route to town buildings and barn upgrades, which is the deliberate mechanism that stops coins alone from buying the whole city — a player with plenty of coins but no train activity still cannot expand freely. 材料係起小鎮建築同升級倉庫嘅唯一途徑，呢個係刻意嘅機制，令淨係有金幣都買唔晒成個城市——就算個玩家有好多金幣但冇乘搭過火車，都唔可以隨便擴建。

Failure modes 失敗情況

A wagon that cannot be filled (because the requested good is not yet produced) simply waits — it does not block the other two wagons, and it does not expire. 如果一個車卡填唔到（要求嘅貨仲未整到），佢會就咁等——唔會阻住其他兩個車卡，亦都唔會過期。

What is not yet implemented 仲未整好嘅部分

The published v0.1.0-22 desktop baseline is available (see the changelog). The material-drop table per wagon trip, and its coupling to the town-building material costs, is balance data checked for reachability before it ships. 已發佈嘅 v0.1.0-22 桌面基準而家可以下載（睇更新日誌）。每次車程嘅材料掉落表，同佢同小鎮建築材料成本嘅關係，都係平衡數據，出街之前會做可達性檢查。