der Spielzug
move
A single action or movement that a player carries out as part of a board game, card game, or strategy game.
Mit diesem cleveren Spielzug hat sie die Schachpartie für sich entschieden.
With this clever move, she won the chess game.

move / toy train
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move
A single action or movement that a player carries out as part of a board game, card game, or strategy game.
Mit diesem cleveren Spielzug hat sie die Schachpartie für sich entschieden.
With this clever move, she won the chess game.

The word consists of 'Spiel' (game/play) and 'Zug' (move/train). The two meanings of 'Spielzug' come from the two meanings of 'Zug': the movement (a move in chess) and the vehicle (the train on tracks).
Sein nächster Spielzug war sehr überraschend.
His next move was very surprising.
The context makes clear which meaning is intended. If it is about board games, cards, or strategy, an action is meant. If it is about children's toys, gifts, or materials like wood, a toy train is meant.
Die Analyse der Spielzüge zeigte, wer der bessere Stratege war.
The analysis of the moves showed who was the better strategist.
When an action in a game is meant, 'Spielzug' (move) is often combined with the verb 'machen' (to make) or with adjectives such as 'klug' (smart), 'entscheidend' (decisive), or 'überraschend' (surprising).
Sie überlegte lange, bevor sie ihren nächsten Spielzug machte.
She thought for a long time before making her next move.
train / move / draft
'der Zug' and 'der Spielzug' can be connected in the area of games. In board games, 'ein Zug' means a single move or action. 'Ein Spielzug' also means an action in a game, but it emphasizes more strongly that it is part of a strategy or the course of play. In addition, 'Spielzug' can also mean a toy train. Then it is not a real means of transport. Learners may confuse the words because 'Zug' can mean both the rail vehicle and a move in a game. So pay attention to the context: means of transport, game action, or toy.

Der Trainer erklärte der Mannschaft einen neuen Spielzug.
The coach explained a new play to the team.
Nach seinem letzten Zug konnte Max die Partie nicht mehr gewinnen.
After his last move, Max could no longer win the game.