The Sha Tin to Central Link (abbreviated SCL; Chinese: 沙中線; Cantonese Yale: sā jūng sin) was an expansion project of the MTR public transport network in Hong Kong.

This extension includes the new Ho Man Tin station to provide interchange with the Tuen Ma line.

The second section (Phase 2) extended the East Rail line from Hung Hom in Kowloon to Admiralty on Hong Kong Island via a newly constructed station at Exhibition Centre.

An underground train depot would have been built beneath the passenger terminal of the former Kai Tak International Airport, adjacent to Prince Edward Road East in Kowloon City; however, under the Kai Tak redevelopment plan released by the government in October 2006, the depot would have to be constructed somewhere else.

[11] On 11 April 2006, MTRC signed a non-binding memorandum of understanding with the government of Hong Kong, the owner of KCRC, to merge the operations of the territory's two railway networks.

The government also intended to choose the KCRC's modified proposal to build the railway, that is, extending the current East Rail line to Hong Kong Island.

Under this proposal, the depot for the Sha Tin to Central Link would have been built underneath the former Tai Hom Village site between Kai Tak and Diamond Hill stations.

The people movers were omitted; Causeway Bay North station was also removed from the proposal due to potential adverse effects on road traffic during construction.

In 2018, a whistleblower leaked information to the Hong Kong media stating that the construction quality at the Hung Hom station was substandard.

Namely, the threaded steel bars that were supposed to link to each other were cut so that they would fit into couplers without actually connecting to the full extent.

Although initially denying the allegations, the MTR and the contractor Leighton Asia[24] later confirmed them, and proposed a plan to open up the concrete at some areas of the stations to inspect the construction quality.

[29][30] Both of the new corridors will receive new signalling systems as part of the Sha Tin to Central Link project.

The North South Corridor will have the TBL train protection and Alstom's ATO system in use on the current East Rail line including the Lok Ma Chau Spur Line replaced with Trainguard MT CBTC supplied by Siemens.

[32] Admiralty, Diamond Hill and Hung Hom stations, all of which are major interchanges following full opening of the new lines, have been expanded or relocated to cater to increased demand.

Because of this, pedestrian facilities with lifts, travellers and covered walkways will be built for the Tsz Wan Shan community, connecting with Diamond Hill station.

[41] Hongkong Post's International Mail Centre in Hung Hom was also demolished to make way for the line.