Kato (N) 10-013 N Gauge Starter Set: City of Trees Suburban Train 701 Series. As a step-up option, adding the 701 Series 1000 Sendai-colored 4-car set allows you to enjoy longer train formations. The 701 Series is a lightweight, stainless steel, three-door, 20m-class AC commuter train first introduced in 1993 to replace passenger trains and JNR-type electric railcars used for commuter and suburban transportation in the Tohoku region.