第七百一十章 理工学院
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十二月二十，李植和天津的官员聚在范家庄外的铁路轨道上，兴致勃勃地看着最新出炉的蒸汽机车“北斗号”。龙腾小说ltxsba.com
经过整整六个月的攻关，苏老三这次交出来的机车就专业多了。李植这半年来努力回忆，画了一些局部设计图给苏老三。所以比起上次直接把往复式蒸汽机架在车轮上的丑陋造型，这次苏老三造出了有些类似十九世纪火车头的蒸汽机车。
“北斗号”基本上是仿造十九世纪早期的蒸汽机车建成的。这个火车头采用卧式多烟管锅炉，传热面积大，生成蒸汽快。锅胴与火箱拼接在一起，锅炉工作压力为三个大气压。有两个与水平线成角度，斜装于锅炉两后侧的汽缸。有一对装于机车前部的动轮，动轮车轴左右各装一曲拐，互成直角，使机车动轮曲拐停在任何位置均能起动。
“北斗号”的乏汽从烟筒喷出，以诱导通风，促进燃烧。这台蒸汽机车卧式锅炉的内外火箱和烟箱是制成一个整体的，进一步加强了蒸气的流转速度。
比起轮船上的蒸汽机，这蒸气机车的蒸汽机高度浓缩改良，算得上是范家庄最先进的机器了。机车整体重九千斤，也就是四吨半，大幅轻于轮船上的蒸汽机。
北斗号停在铁轨上，苏老三和三个工匠不停地往机车上运煤，准备进行试车。
李植让人运来了三个大型车厢，车厢里装满了粮食，足足有一百多石，算下来差不多是十五吨的载重。这么多的载重相当于二十辆四轮马车的载荷量。
围观的众人这是第一次看到蒸气机车，一个个站在李植身后窃窃私语，怀疑这机车能不能拉动这么多的粮食。
李兴歪着头看着这台蒸汽机车，说道：“大哥，这车子要是能跑起来，那以后马车就要被淘汰了！”
祖大寿反复打量那火车头，摇头说道：“我还没听说过可以自己跑动起来的铁皮车。”
苏老三几人运完了煤，开始把蒸汽机车的锅炉烧了起来。滚滚的白色水蒸气开始不断从蒸汽机车的烟囱中喷出来，在十二月的寒冷天气里显得格外的浓厚。过了一会，火车头上空几乎形成了一片蒸汽云。
李植见差不多了，一挥手：“开车！”
苏老三大声喊喏，拉下了蒸汽机车的主动轴。蒸汽机车抖了一下，突然间有了力气，动轮开始慢慢旋转起来。
动轮在钢轨上缓缓转动，最终带动了机车和车厢前进。在众人的惊叹声中，整辆火车一点点加速，在钢轨上跑了起来。
没有马的车子自己跑起来了，亲眼目睹这一幕的官员们十分吃惊。他们跟着缓缓移动的火车一起往前跑，在铁路旁边的土路上追着这个吐着浓烟的怪兽。
李植也颇有兴致，撒开腿跑在所有人的最前面，要看这个火车头到底能开多快。
但两条腿哪里跑得过火车？火车头越跑越快，最终把追在后面的围观官员们全部甩开了。火车头喷着黑烟一骑绝尘，跑出了健马才能拥有的速度，一路朝铁路的终点开去。
众人追不上火车，停在了铁路边上，望着越开越远的火车头摇头叹息。
李兴跑得出了些细汗，擦了擦汗说道：“大哥，这火车头也太厉害了，这速度起码是装货马车的七、八倍啊。这么算下来一个火车头就能当一百五十辆双轮马车。”
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