Tamil nadu and gt both has very poor coaches despite they are very long distance trains.
they don't have charging ports in bogies.Both of them has charging ports only near to door .Now it is needed to provide lhb asap for legendary gt sf and king tamilnadu .I had travelled in shridham exp condition of ur + sleeper class is excellent ,even they have charging ports in ur.SR you must have to learnt something from WCR