Scale Model of Railroads and Tracks
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2169, Puzzle 4 (Sewers and Pipes).
Question is: Scale Model of Railroads and Tracks
and the answer is: TRAINSET
Word Meaning:
TRAIN SET — A toy consisting of one or more miniature model trains and the tracks, equipment, scenery, etc. that go with them.
Definitions from Wiktionary.