See also: Longest train services of Indian Railways.
| Raptisagar Express /Kochuveli-Gorakhpur Express | |
| First: | [1] |
| Operator: | North Eastern Railway zone of Indian Railways |
| Start: | Thiruvananthapuram |
| Stops: | 60 |
| End: | Gorakhpur |
| Distance: | 3248km (2,018miles) |
| Journeytime: | 57 hours 05 minutes |
| Frequency: | Tri-weekly |
| Class: | First AC, 2 Tier AC, 3 Tier AC, Sleeper Class, General |
| Seating: | Yes |
| Sleeping: | Yes |
| Catering: | Available |
| Observation: | Large windows |
| Baggage: | Available |
| Stock: | Loco: WAP-4/WAP-7 |
| Trainnumber: | 12511 / 12512 |
| Speed: | Average: 55 km/h Maximum speed: 110 km/h |
| Raptisagar Express /Ernakulam-Barauni Express | |
| Operator: | East Central Railway zone of Indian Railways |
| Start: | Ernakulam Junction |
| Stops: | 63 |
| End: | Barauni |
| Distance: | 3436km (2,135miles) |
| Journeytime: | 47 hours |
| Frequency: | Weekly |
| Class: | First AC, AC 2 tier, AC 3 tier, AC 3 tier economy, Sleeper class, General |
| Seating: | Yes |
| Sleeping: | Yes |
| Catering: | Available |
| Observation: | Large windows |
| Baggage: | Available |
| Stock: | Loco: WAP-7 |
| Trainnumber: | 12521 / 12522 |
The Raptisagar Express trains are two sets of Express trains which run tri-weekly/weekly between Kochuveli/Ernakulam Junction and Gorakhpur/Barauni in India. This train goes via the cities of Kollam, Alappuzha, Kochi, Thrissur, Palakkad, Coimbatore, Tirupur, Erode, Salem, Chennai Central, Vijayawada, Khammam, Warangal, Ramagundam, Nagpur, Bhopal, Jhansi, Kanpur, Lucknow, Gonda and Basti. The current operator of the train is North Eastern Railway zone/East Central Railway zone of Indian Railways. It is the 10th longest train service of Indian Railways.
Both trains run more than 3200 km per service.
The name "Raptisagar" is given to the train as the train connects the cities Thiruvananthapuram/Cochin which is situated near the Arabian Sea and Gorakhpur/Barauni from where Rapti river flows.
Both sets of trains have 22 coach cars which includes First AC, AC 2 tier, AC 3 tier, AC 3 tier economy (only on 12521/12522), Sleeper, General Sitting (Unreserved), and Pantry Car.
12511 – Starts from every Sunday, Tuesday and Friday at 6:35 hrs and reaches Kochuveli on Day 3 at 17:20 hrs.
12512 – Starts from Kochuveli every Sunday, Tuesday and Wednesday at 6:15 hrs and reaches Gorakhpur Junction on Day 3 at 15:20 hrs
12521 - Starts from Barauni every Monday at 22:51 hrs and reaches Ernakulam Junction on Day 3 at 11:30 hrs.
12522- Starts from Ernakulam Junction every Friday at 10:50 hrs and reaches Barauni on Day 3 at 00:05 hrs.
Both sets of trains reverse at MGR Chennai Central.
The trains have an average speed of about 58 km/h during its journey.