"由铁道运输" can be translated into English as "transported by railway" or "via railway transportation".
Here are some example sentences to illustrate the usage:
The goods will be transported by railway to the destination.
（货物将通过铁路运输到目的地。）
We choose to ship the products via railway transportation due to its cost-effectiveness and reliability.
（由于成本效益高且可靠，我们选择通过铁路运输产品。）