摘要
选择几个铁路中的物理论题进行讨论，剖析教师从基础物理学到大量背景知识中所遇到的困难．通过讨论希望给教师一个范例：怎样通过对所需问题的调查研究来丰富有用的物理书本知识教育．
A few selected topics of the physics of railroad tracks are discussed ;thereby the profile of difficulties reaches from simple introductory school physics to ambitious background information for the teacher. The selection is intended to give an example how the usual book-knowledge-physics instruction can be enriched by producing the flavor of investigative thinking around demanding problems.
