鉄道遅延アラート is a free Android app developed by yokoyamap in the Travel & Navigation category. It provides real-time train operation information for railways across Japan and sends notifications to the status bar in case of delays.

With its alarm feature, the app automatically retrieves and notifies users, eliminating the need to manually check train operation status before commuting or returning home.

Users can specify up to three railway companies to retrieve information from. Additionally, they can also view the operation information on a dedicated page within the app.

The app offers detailed customization options, allowing users to choose whether to receive vibration notifications during delays, receive notifications even when there are no delays, and set specific areas, weekdays, and time intervals for data retrieval and updates.

When a delay notification appears in the status bar, tapping the message opens the app's browser, displaying the delay information page of the respective railway company, enabling users to quickly access detailed information.

The delay information is retrieved from the operating information page of Tetsudo.com, a popular railway information website in Japan.