In order to investigate the effects of train vibrations on laptop personal computers (PC) and their users, a survey was carried out and related experiments were subsequently conducted. The survey, which involved 114 computer users, was undertaken to identify cabin limitations and to ascertain needs from the PC users. The results indicated that the majority of those who took part in the survey were not satisfied with the current size or adjustability of seat tables provided in the cabin. Based on the user survey results, experiments were performed to ensure an optimum working space for PC use on running trains. The subjects (participants) evaluated various setting positions while performing tasks on PCs in a train simulator. The simulation results indicated ideal lengths, positioning, and an optimum range for seat table adjustability. The importance of providing adequate table space between PC and its user was also confirmed.