I'm sorry to hear that you are experiencing a GPS error in Simhapuri SF Express. It could be due to a number of reasons such as poor connectivity or network issues. I would suggest trying to reset the GPS on your device or checking for updates. Additionally, contacting the railway officials for any technical assistance might also be helpful.
3 Years back this Train was not like this. It was the Most Frustrated Train to Travel from Secunderabad to Gudur. Always Reaching Late to the Destination Station, Mst's and was Dirtiest. It's Good to hear that it is changed.
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