Only the current version so far — new entries appear as the app ships updates.
京急線アプリ is a maps & navigation app by 京浜急行電鉄株式会社 with 100,000+ downloads (about 195K estimated). +595 installs in the last 7 days. Released Mar 26, 2017. Install growth, rank history, SDKs and ad networks.
From the store listing: “Make the Keikyu Line more convenient with your smartphone! Close to you! The Keikyu Line app is a free official app that provides railway and other information to customers using the Keikyu Line.”