Tsukuba , Japan (1985), the HSST -03 ( Linimo ) wins popularity in spite of being 30 km/h (19 mph) at the Tsukuba World Exposition . In Saitama , Japan (1988), the HSST-04-1 was revealed at the Saitama exhibition performed in Kumagaya . Its fastest recorded speed was 30 km/h (19 mph). [ 24 ]