This is the 4704th most frequent Russian word.
железнодорожной
"Railway" or "railroad-related."
Железнодорожной is used here as an adjective in the genetive case modifying сети (network).
Эта станция является частью железнодорожной сети страны.
This station is part of the country's railway network.
Железнодорожной is used here as an adjective in the genetive case modifying экспозиции (exhibition).
Мы видим старинный вагон в железнодорожной экспозиции музея.
We see an ancient wagon in the railway exhibition of the museum.
Железнодорожной is used here as an adjective in the genetive case modifying компании (company).