Let me read more of the CSV data and understand the existing codebase structure before implementing.

Now let me read the remaining CSV data and the rest of the files I need:

Now let me read the rest of the CSV to get all station names across all lines:

Now I have a comprehensive understanding of all the data. Let me read the remaining CSV sections for the Central and Harbour lines:

Now I have a thorough understanding of the codebase and the CSV data. The CSV contains stations across these lines:

• Western Line (Churchgate to Dahanu Road)
• Central Line 1 (CST to Kasara/Khopoli) - the Karjat branch
• Central Line 2 (CST to Kasara) - the Kasara branch
• Harbour Line (CST to Panvel)
• Trans Harbour (Thane to Panvel)
• Dahanu-Virar-Panvel (Vasai Road-Diva corridor)

The existing code already has Western, Central, and Harbour lines, but is missing many stations and several lines. I need to:

1. Update mumbai-transit.ts - Add all missing stations from the CSV, add new lines (Trans-Harbour, Kasara branch, Karjat/Khopoli branch, Dahanu extension, Vasai-Diva-Panvel corridor)
2. Update mumbai-localities.ts - Add all railway stations as searchable localities
3. Update station-detail.tsx - Show line change info clearly on the detail page

Let me now implement these changes:

Now let me update the localities file to include all train stations as searchable locations:

Now let me update the search screen to show the station line info in suggestions, and update the station detail page to properly display line changes:

Now let me update the station detail page to show proper line change information with legs:

Now let me update the station detail to show proper line change information with a better visual display:

Now replace the station-by-station route section with improved line change display:

Now I need to add the ArrowRight import to station-detail.tsx:

Now let me also update the ModeData type to include the leg1 and leg2 data from the API and update the API to pass that info:

Now update the quick routes on the search screen to include cross-line examples:

Now let me also update the mode selection component to show more meaningful line info for trains:

Now let me also increase the search suggestion limit in the search screen to show more results:

Now let me make sure the API handles the old "Elphinstone Road" reference properly and that "Prabhadevi" mapping is correct. Let me also check if there's a missing Parel reference in the old code (it previously mapped Prabhadevi on the central line, but actually Parel is on the central line):

The API route looks good - it already imports all the right functions from mumbai-transit.ts. The updated transit data will be picked up automatically. Let me verify the app compiles by checking there are no type issues. Let me also add line info to the display name resolution in the mode-selection display:

Good. Let me now verify the search screen suggestions dropdown has proper scrolling for the increased number of results:

Now let me verify that the LINE_DISPLAY_NAMES import in mode-selection.tsx is being used but also that we removed the unused import. Actually, looking at it, we imported it but didn't end up using it inline in mode-selection (we only showed transfer station name). Let me clean up:

Let me verify the build compiles correctly by checking the app page quickly:

Good. Let me verify the station-detail imports are all correct:

Everything looks good. Here's a summary of all the changes made:

1. lib/mumbai-transit.ts - Completely updated with all railway stations from the CSV dataset across 7 lines: Western (Churchgate to Dahanu Road, 37 stations), Central Main (CST to Kalyan, 26 stations), Central-Karjat Branch (Kalyan to Khopoli, 15 stations), Central-Kasara Branch (Kalyan to Kasara, 12 stations), Harbour (CST to Panvel, 30 stations), Trans-Harbour (Thane to Panvel, 14 stations), and Vasai-Diva-Panvel (13 stations). Added line display names, line colors, and optimized the transfer-finding algorithm to find the shortest route across all possible interchange stations (Dadar, CST, Kurla, Thane, Kalyan, Diva, Panvel, etc.).

2. lib/mumbai-localities.ts - Now auto-generates locality entries from all train and metro stations, so every station is searchable. Stations are prioritized in search results and tagged with their line name.

3. components/travel/search-screen.tsx - Search suggestions now show a train icon for station entries and display the line name as a colored badge. Dropdown supports scrolling for more results. Quick routes updated to showcase cross-line journeys.

4. components/travel/station-detail.tsx - The route detail page now shows a prominent "Line Change" notice when transfers are required, with colored line badges (e.g., "Western Line -> Central Line"), making it clear exactly where and how to change trains.