Double decker express, as the name suggests, are 2 storeyed trains that can accommodate more number of passengers compared to other express or mail trains. These trains ply between important cities which are just a few hundred kilometres apart. These are fully AC coaches and have only seating facilities with Chair Car (CC) class. There is a ladder to climb up the upper deck of coach. These trains do not offer catering facilities. Double-decker Trains are usually painted in vibrant yellow and red color while some other express trains also have double decker non ac coaches. 1 double-decker train runs from Katpadi Jn to Arakkonam - MAS DOUBLE DECK (22626).

Katpadi Jn to Arakkonam MAS DOUBLE DECK (22626) departs from Katpadi Jn station (KPD) at 17:25 and arrives Arakkonam station (AJJ) at 18:13. This train has 1 stoppages. Katpadi Jn to Arakkonam double-decker fare is Rs.310 in Chair Car and Rs.70 in Second Seater for this train.

Humsafar trains are long distance superfast trains that traverses overnight journeys. This is a new concept by the Indian Railways. Some Humsafar trains also run for more than 24 hours. Keeping in mind the middle class travellers, Humsafar was launched last year by the Former Railway Minister Mr. Suresh Prabhu. It has only Third AC class coach and have optional meal service. This train follows dynamic pricing meaning fare increases as the seat availability decreases. However, these trains hold lesser priority than Rajdhani and Shatabdi trains. Humsafar trains are equipped with modern day amenities and enhanced safety features. There are CCTV cameras fitted in every coach of Humsafar trains and there are charging points for each berth. One can also see current running speed of train on the LEDs fitted above doors. These trains are characterized by beautiful graffiti paint with vibrant sky blue color on outer surface of coaches. 2 humsafar trains run from Katpadi Jn to Arakkonam - SBCDNR HUMSAFAR (06509) and HUMSAFAR EXP (22354).

Katpadi Jn to Arakkonam SBCDNR HUMSAFAR (06509) departs from Katpadi Jn station (KPD) at 12:40 and arrives Arakkonam station (AJJ) at 13:28. This train has 1 stoppages.

Katpadi Jn to Arakkonam HUMSAFAR EXP (22354) departs from Katpadi Jn station (KPD) at 17:50 and arrives Arakkonam station (AJJ) at 18:43. This train has 1 stoppages. Katpadi Jn to Arakkonam humsafar fare is Rs.615 in Third AC for this train.