As you can see from the video, the train is not the cleanest or most comfortable thing in the world. But hey, it's all about the experiences! On our way back, we rode the A/C sleeper trains that have airconditioning and beds that are covered in clean sheets with pillows. Much more comfortable and quiet but not as interesting.
This sleeper train did get completely full but most of the people got off the train at a stop right before we started eating lunch.
Btw, the best dosas are at train stations. :)