Their legacy is still evident in the Kazakh rail system, which conforms to the Russian rail gauge instead of the Chinese gauge.

So, it is very important for the rail gauge to be measured precisely and high efficiently and it is still an important research of the train department in every country to be in face.

To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.