Very dangerous train. Specially stay away from General coaches. Its always heavily excessively crowded. Getting inside a tedious task.
And also if you want to travel in SL, then book minimum 3-3.5 months in advance.
And during summers and festives, forget about confirmed seats.
And if you have to travel and you believe in "service as per money", then i would...
more... say,opt for some other train. 72 people coach carries nearly 100-110 people.