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The Yelagiri express is a daily train which was running between Jolarpettai and Chennai.  The train stops at Vaniyambadi, Ambur, Melpadi, Valathoor, Gudiyattam, Katpadi,Mukundarayapuram, Walajah Road, Sholingur, Anavardikanpettai, Chitteri, Arakkonam Junction, Thiruvallur, Perambur and Chennai Central.
This train traces its name to the Yelagiri hills near Jolarpettai. Jolarpettai is at the foothills of Yelagiri.
The regional people and regular passengers call it as JayPee (JP-Jolarpet)
The train is usually hauled by a powerful WAP4 locomotive. As the train completes its to-fro journey in a single day, there is a dedicated WAP4 Locomotive for this train. The train has 24 coaches. The coaches include 20 General second class, 2 First class, 2 luggage cum-brake van coaches. First 3 and Last 3 compartments are dedicated ladies coaches.
Even though it is classified as Express, this train stops in many stations but not all. This is why the train uses WAP4, which can accelerate and decelerate the 24 carriage train between frequent stoppages. The train arrives Chennai Central by 9:15 and departs by 17:55 which greatly helps the passengers to attend their work everyday even from a distant home.