noun
multilayer train; train formed by joining sections with different origins/destinations
Technical railway term. Refers to a single train that is formed by coupling two or more trainsets that started from different origins or will split to different destinations. Not a double-decker train.
多層建て列車は、途中の駅で分割されることがあります。
A multilayer train may be split at an intermediate station.
この多層建て列車は、前の4両が東京行き、後ろの4両が新宿行きです。
In this multilayer train, the front four cars are bound for Tokyo and the rear four for Shinjuku.
Compound of 多層 (たそう, 'multilayer') + 建て (だて, 'building; structure') + 列車 (れっしゃ, 'train'). The term describes a train 'built' from multiple layers (sections) that have different origins or destinations.