German-made Marklin trains are highly detailed electric trains that are made in 3 different sizes (or scales): Marklin HO scale trains, Marklin Z scale trains, and Marklin G scale trains, which are also known as Marklin 1 trains.

To understand the size differences: a Marklin HO scale locomotive is 1/87th the size of the real-world prototype it is modeled after; a Marklin Z scale locomotive is 1/220th the size of the prototype; and a Marklin 1 Gauge locomotive is about 1/32nd the size of the prototype.

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	Marklin Z: 81080 International Express Train Set	$389.99	10h 31m
	MARKLIN Z 88732 TEE TRAIN & 87931 ADD ON SET MINT COND	$599.00	12h 30m
	81429 Marklin Z SP.ED. 50 Y Baden-Württemberg Train Set	$349.00	16h 10m
	Marklin Z 81427 ChemOil AG train set 5 pole motor	$289.00	16h 20m
	Marklin HO Vintage Passenger Train Set, DA 846 3	$350.00 $500.00	16h 47m
	43670 MARKLIN HO EuroCity Exp. Train Passenger Car Set	$279.99	18h 6m
	81865 Marklin Z Large Freight Train Starter Set 120V	$419.99	18h 23m
	8134 Marklin Z Mail Freight Train Set	$249.00	1d 1h 25m
	29539 MARKLIN HO Freight Train Set w. NEW MOBIL STATION	$381.52 $408.77	1d 6h 19m
	MS-TOYS ! MARKLIN H0 Powered rail car train set 37503	$379.00	1d 6h 58m
	Marklin Z 8107 train set City-Bahn	$199.00	1d 17h 30m
	81418 Marklin Z Ae 3 6 SBB Swiss Passenger Train set	$495.00	2d 3m
	PRE-WAR MARKLIN HO SCALE TRAIN THIRD 3 RAIL TRACK SET	$399.99	2d 4h 50m
	marklin z pasenger train set insider rare	$200.00	2d 16h 34m
	VINTAGE MARKLIN TRAIN PART #7320 INTERIOR LIGHTING SET	$25.00	2d 17h 5m
	Vintage Marklin HO Train Set No. 2875	$102.50	2d 17h 37m
	Marklin HO - "Maintenance Train" Car Set #4509	$55.00	2d 19h 10m
	Marklin -ALEX Train Set. (Zugpackung Alex)	$330.00 $366.00	2d 21h 33m
	Vintage old 3148 Train Set Marklin Maerklin AC 3-rail	$650.00	2d 22h 12m
	Marklin Digital HO 49951 3 Auxiliary Car Train Set	$76.00	2d 22h 14m

A few other pointers for those new to Marklin:
Maerklin Z scale trains are also sometimes referred to as Marklin Mini-Club trains and also Marklin Spur Z trains .
As mentioned above, Marklin G gauge trains are also referred to as Marklin 1 guage trains and Marklin 1 scale trains and also as Marklin Maxi trains.
Marklin used to produce a line of HO scale hobby trains ("hobby" denoting less detailed than "model" trains) which were called Marklin Primex HO scale trains.