Return the next few scheduled Caltrain departures.

Args: origin: Station name (e.g. 'San Jose Diridon', 'Palo Alto', 'San Francisco'). Supports common abbreviations like 'SF' for San Francisco, 'SJ' for San Jose. If station is not found, use list_stations() to see all available options. destination: Station name (e.g. 'San Francisco', 'Mountain View', 'Tamien'). Supports common abbreviations like 'SF' for San Francisco, 'SJ' for San Jose. If station is not found, use list_stations() to see all available options. when_iso: Optional ISO-8601 datetime (local time). Default: now.

Note: If you get a "Station not found" error, try using the list_stations() tool first to see exact station names, then retry with the correct spelling.

List all available Caltrain stations.

This tool is useful when you need to find the exact station names, especially if the next_trains() tool returns a "Station not found" error. Station names are case-insensitive and support some common abbreviations like 'SF' and 'SJ'.

Returns a formatted list of all Caltrain stations that can be used as origin or destination in the next_trains() tool.