1、首先道轨型号尺寸表示方法主要用理论重量来表示。

2、其次即每米的公斤重量，钢轨主要分为轻轨和重轨两种类型。

3、更好后轻轨是指每米的公斤重量小于或者等于30千克的钢轨。

1. Firstly, the representation method of track model size is mainly based on theoretical weight.

2. Secondly, the kilogram weight per meter is divided into two types of steel rails: light rail and heavy rail.

3. Finally, light rail refers to steel rails with a weight of less than or equal to 30 kilograms per meter.