lower berth quota is meant for senior citizens and ladies above 45 yrs old travelling alone. there are specific nos. of seats in each class. once those seats are exhausted, they will be allotted seats in general quota or whichever is applicable (PQWL, RLWL or GNWL). upon charting if there is any vacancy in lower berth quota then the 1st person eligible for that in WL is allotted the confirmed berth.