# Super Rapid Train

The Super Rapid Train, often known as SRT (Korean: 에스알티; RR: eseualti), is a high-speed rail service in South Korea operated by SR Corporation. The service starts at Suseo station in southeast Seoul and terminates at either Busan station or Mokpo station.
Around 86% of the train service runs 50 meters underground between Suseo and Cheonan-Asan stations. Dongtan station, the first station after departing from Suseo, is the first underground high-speed railway station in Korea. The SRT runs the Seoul–Busan route 8 minutes faster than KTX as it travels exclusively on dedicated Suseo–Pyeongtaek, Gyeongbu and Honam HSR lines. The Suseo-Pyeongtaek HSR line was built exclusively for this service.

## Branding

Before official announcement by SR, Ministry of Land, Infrastructure and Transport used tentative term called Suseo High-speed Railway (수서고속철도).
On October 12, 2015, SR proposed three candidate name for new high-speed rail service – SRT (Super Rapid Train), HSR (High-speed train of SR), SRH (SR High-speed train) in which SRT (Super Rapid Train) was chosen.

## Electrification

The SRT operates 25 kV AC on the entire line and interconnection with Korail is 1.5 kV DC. At Suseo Station, the power comes from rigid overhead lines before transitioning to a 1500mm overhead catenary wire after leaving the station.

## Route

Legend
| ● | All trains stop |
| ○ | Some trains stop |
| △ | Few trains stop |

### Suseo–Busan

| Station | Distance (from Suseo) | Distance (from Suseo) | Stopping |
| Station | km | mi | Stopping |
| Suseo | 0.0 | 0.0 | ● |
| Dongtan | 32.6 | 20.2 | ○ |
| PyeongtaekJije | 53.6 | 33.3 | △ |
| Cheonan–Asan | 78.7 | 48.9 | ○ |
| Osong | 107.3 | 66.6 | ○ |
| Daejeon | 142.5 | 88.5 | ● |
| Gimcheon (Gumi) | 216.3 | 134.4 | △ |
| Dongdaegu | 269.4 | 167.3 | ● |
| Gyeongju | 318.4 | 197.8 | ○ |
| Ulsan | 348.4 | 216.4 | ○ |
| Busan | 400.1 | 248.6 | ● |

### Suseo–Mokpo

| Station | Distance (from Suseo) | Distance (from Suseo) | Stopping |
| Station | km | mi | Stopping |
| Suseo | 0.0 | 0.0 | ● |
| Dongtan | 32.6 | 20.2 | ○ |
| PyeongtaekJije | 53.6 | 33.3 | △ |
| Cheonan–Asan | 78.7 | 48.9 | ○ |
| Osong | 107.3 | 66.6 | ○ |
| Gongju | 151.1 | 93.8 | △ |
| Iksan | 197.1 | 122.4 | ● |
| Jeongeup | 239.2 | 148.6 | △ |
| GwangjuSongjeong | 289.7 | 189.0 | ● |
| Naju | 305.5 | 189.8 | △ |
| Mokpo | 356.5 | 221.5 | △ |

## Rolling stock
### KTX-Sancheon

The train service is operated using 22 KTX-Sancheon Class 120000 train sets and 10 KTX-Sancheon Class 130000 train sets. Class 120000 train sets was originally operated by Korail's KTX service before it was transferred to SR at the end of 2016, while Class 130000 train sets are new builds.

## Extension beyond HSRs

Since Super Rapid Train only has two routes, there are many local cities that only KTX serves. In November 2016, Jeonju and Yeosu urged the SR Corporation to run trains on the Jeolla Line. In December 2016, the mayor of Pohang proposed running SRT service to Pohang station using the Donghae Line. In January 2021, the mayor of Changwon urged the SR Corporation to run SRT service to Changwon station using the Gyeongjeon Line.
On September 1, 2023, SRT services using Jeolla Line, Donghae Line and Gyeongjeon Line were launched.