The prefix on the train in Lanzhou, Gansu Province was written by Gansu calligrapher Zhang Bangyan. Because the word "blue" written by teacher Zhang Bangyan is different from the word "blue" we learned. The word "Lan" that we see and write in our life usually shortens the middle horizontal line of the word "Lan" and lengthens the bottom horizontal line, which is neither too long nor too short, just enough to cover the middle horizontal line. In fact, this blue teacher Zhang Bangyan didn't write wrong!
When Mr. Zhang Bangyan, known as the father of bamboo slips, studied calligraphy, our simplified characters were not popular yet. So there will be a big difference between traditional Chinese characters and simplified Chinese characters. In addition, wet writers will write a word in many patterns and ways to show their writing style, so the special word "Lan" at Lanzhou Railway Station was written by Teacher Zhang. Therefore, the word "Lan" in Lanzhou Railway Station is not a typo, but written by our calligraphers with their own unique writing skills.
In fact, there is nothing strange and curious about these things. For example, many teachers of China Calligraphers Association have written something like "the number one train station card". For example, Wenzhou Station inscribed by Master Nan, Guilin Railway Station inscribed by Teacher Guo Moruo, Huai 'an Station inscribed by Premier Zhou and so on. We can understand this word from any angle. From the perspective of calligraphy art, this word is not only correct, but also surprising.