A X, usually on bicycle, collects Ys from homes or from the Y makers. The Ys have some sort of distinguishing mark on them, such as a color or symbol. The X then takes them to a designated sorting place, where he and other collecting Xs sort (and sometimes bundle) the Ys into groups. The grouped boxes are put in the coaches of train, with markings to identify the destination of the Y .
The markings include the rail station to unload the Ys to the building address where the Y has to be delivered.At each station, Ys are handed over to a local X , who delivers them. It has been recognized since 2002 to be one of the most reliable supply chains in the world, after being given a six sigma rating by Forbes Magazine.
Although the service remains essentially low-tech, the X have started to embrace technology, and now allow booking for delivery through SMS An on-line poll on the web site ensures that customer feedback is given pride of place. The success of the system depends on teamwork and time management.
X form links in the extensive delivery chain, that there is no system of documentation at all. A simple colour coding system doubles as an ID system for the destination and recipient. There are no multiple elaborate layers of management either — just three layers.
Id X and Y above
The answer is
X-Dabbawallahs
Y-Dabbas or lunch boxes
a good crack from Aravind