Means of transportation comprise a track and vehicle guided along the track with the self-routing faculty of track selection. That is to say, two stationary guides are positioned at each branch of the track, and each vehicle carries means to select one or other of the guides and hence to follow one or other of the alternative routes at each track branch. For optimum track utilisation the vehicles, particularly at busy traffic periods, are grouped so that a plurality of vehicles run as a ''''contact train'''' with the individual vehicles in each group in contact one with the next. Although in contact they remain separate, so that at each branch any vehicle is free to follow the chosen or preprogrammed route at that branch.