- The 103 series is a commuter train that debuted in 1963, with over 3,400 units produced.
- The Senseki Line is a route that connects Aoba-dori Station in Miyagi Prefecture to Ishinomaki Station. It is the only DC electrified section of the JR lines in the Tohoku region.
- After the division and privatization of Japan National Railways, the 103 series was inherited by JR East. Starting in 1989, the vehicles deployed on the Senseki Line underwent refurbishment to improve their durability.
- This refurbishment included changes such as the front windows being divided into two, unique to the Senseki Line, as well as the replacement of boarding doors, side window sashes, and the substitution of the front operation display with a type indicator.
- Starting around 1998, the exterior design was gradually updated to a new blue and white color scheme.
- This product reproduces the appearance of the formation including the KUMOHA103 type, retaining the original ventilators on the roof while painted in the new color scheme.
Train can be motorized to an N scale train and is compatible with TM-18 Motorized Chassis, TT-03R (for KUHA 103/SAHA 103), TT-05 (for KUMOHA 103/MOHA 102) Trailer Conversion Kit and Tomix 0230 Pantograph.