In the countryside, since only a few trains are running, in case you miss your train you have to wait one hour until the next one.
ご質問ありがとうございます。
「田舎は電車の本数が少ないので、逃すと次は1時間後です」は英語で「In the countryside, since only a few trains are running, in case you miss your train you have to wait one hour until the next one.」と言えます。
In the countryside - 田舎
in case you miss your train - (電車)を逃すと
you have to wait one hour - 1時間待たないといけない
until the next one - 次は
ご参考になれば幸いです。