<p>此條目列出1840年發生有關鐵路運輸的事件。
</p>


<h2><span id="3.E6.9C.88"></span><span id="3月">3月</span></h2>
<ul><li><span></span> <b>3月9日</b>：<span data-orig-title="威爾明頓－威爾頓鐵路" data-lang-code="en" data-lang-name="英語" data-foreign-title="Wilmington and Weldon Railroad"><span>威爾明頓－羅利鐵路</span></span>通車，是當時世界上最長的鐵路線。</li></ul><h2><span id="5.E6.9C.88"></span><span id="5月">5月</span></h2>
<ul><li><span></span> <b>5月11日</b>：<span data-orig-title="倫敦及西南鐵路" data-lang-code="en" data-lang-name="英語" data-foreign-title="London and South Western Railway"><span>倫敦及西南鐵路</span></span>延長至南安普敦。</li></ul><h2><span id="7.E6.9C.88"></span><span id="7月">7月</span></h2>
<ul><li><span></span> <b>7月1日</b>：<span data-orig-title="米德蘭郡鐵路" data-lang-code="en" data-lang-name="英語" data-foreign-title="Midland Counties Railway"><span>米德蘭郡鐵路</span></span>通車。</li></ul><h2><span id="8.E6.9C.88"></span><span id="8月">8月</span></h2>
<ul><li><span></span> <b>8月17日</b>：<span data-orig-title="米蘭－蒙扎鐵路" data-lang-code="en" data-lang-name="英語" data-foreign-title="Milan–Monza railway"><span>米蘭－蒙扎鐵路</span></span>通車。</li></ul><!-- 
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此條目列出 1840 年發生有關鐵路運輸的事件。

## 3 月

* **3 月 9 日**：威爾明頓－羅利鐵路通車，是當時世界上最長的鐵路線。

## 5 月

* **5 月 11 日**：倫敦及西南鐵路延長至南安普敦。

## 7 月

* **7 月 1 日**：米德蘭郡鐵路通車。

## 8 月

* **8 月 17 日**：米蘭－蒙扎鐵路通車。
1840年鐵路