These trains are expected to replace the Metro Cammell EMUs that currently run on the East Rail line. The new R-stock trains are wider than existing units and can accommodate more passengers per car; however, the length of each train will be cut from the current 12-car configuration used on the Metro Cammell and SP1900 EMUs to nine cars. This is due to space constraints imposed by new underground platforms on the Sha Tin to Central Link. MTR will also upgrade existing signalling systems used on the East Rail line which will enable trains to operate at two-minute headways on average, instead of the current three-minute interval, which the MTRC expects will be able to compensate for the loss of capacity resulting from the shorter trains. However, there are concerns from local residents that this will not be effective.