Public transportation such as busses and trains that run above ground are easily influenced by the heavy snow, so I would like the underground transportation network to be developed.
ご質問ありがとうございます。
"Public transportation such as busses and trains that run above ground are easily influenced by the heavy snow,"＝「地上を走るバスや電車である公共交通機関は、大雪に影響を受けやすい」
"so I would like the underground transportation network to be developed."＝「従って、私は地下の交通網を発達させたい。」
ご参考に。
アメリカ合衆国 
