Firozpur–Rameswaram Humsafar Express
The 20973/20974 Firozpur – Rameswaram Humsafar Express is an express train of the Indian Railways connecting  with . It is currently being operated with 20973/20974 train numbers on a weekly basis. After its extension from Ajmer to Firozpur, It became as the Longest Running Humsafar category train by just surpassing SMVT Bangalore Agartala Humsafar express. And also became as 5th longest train service by Indian Railways. Background 
The inaugural service, bearing train number No.09603 of this service was launched on 27 September 2018 at () by Speaker of the Lok Sabha, Sumitra Mahajan. The regular services are scheduled to commencing from 2 October 2018 at  on every Tuesdays and 6 October 2018 at  on every Saturdays bearing train numbers 20974 and 20973 respectively. At present, It is the only train which is running between Indore to Southern Part of Tamil Nadu. It was then extended to Firozpur Cantonment from 2 October 2023. Rakes 

The service is completely fitted with 3-tier AC coaches designed by Indian Railways with features like LED screen display to show information about stations, train speed and will have announcement system as well, Vending machines for tea, coffee and milk, Bio toilets in compartments as well as CCTV cameras. Apart from 16 AC 3-tier coaches earmarked for passengers, the train will also have 1 Pantry Car and 2 End-on Generator coaches. Route 
This weekly service originates every Saturday traverses about  through , , , , , , ,  (Indore Suburban), , , , , , , , , , and  reaching on Tuesdays. On the return journey, it leaves the same Tuesday traverses the same route and reaches Firozpur Cantonment on Fridays. It takes 62 hours approximately to completely the service at a rate of . Reversals and Loco Changes

This train has no Rake Sharing and running with Single dedicated rake. REVERSALS 

This train reverses direction in three places, 

 (Indore). LOCO CHANGES

Bhagat Ki Kothi based  will usually haul this train between  and . From , Bhagat Ki Kothi based  will lead this train till . Then GOC based  or WDP 4 will take in charge of this train from  to . Demands
There are also demands for this train to make a stop at Ramanathapuram, Paramakudi, Sivagangai Karaikudi Junction, Pudukkottai and Vriddhachalam Junction. as this train runs with low patronage between Chennai Egmore and Rameswaram. 