The MTR is considering expanding its on-train digital announcement systems to its 38 stations. A trial of new sound equipment has started at Kwai Fong Station. An MTR spokesman said an overhaul of audio equipment could be carried out as a result of the trial which will also look at improving acoustics. The trial was launched after complaints from passengers who could not decipher transfer announcements about buses during the spate of delays earlier this year. 'There is no set time limit for the trial, we will just see how it goes,' the spokesman said.