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Route map
	Legend
	19.7 km
	12.2 mi
	39.3 km
	24.4 mi
	49.3 km
	30.6 mi
	59.4 km
	36.9 mi
	66.8 km
	41.5 mi
	75.3 km
	46.8 mi
	Kocaeli
	Sakarya
	99.1 km
	61.6 mi
	107.1 km
	66.5 mi
	113.5 km
	70.5 mi
	115.9 km
	72 mi
	This diagram: view; talk; edit;

Ada Express
	A westbound train near İçmeler.
Overview
Service type	Regional rail
Status	Operating
Locale	Northwestern Anatolia
Predecessor	Adapazarı Express
First service	5 January 2015
Current operator(s)	TCDD Taşımacılık
Former operator(s)	Turkish State Railways
Route
Termini	Gebze station, Gebze; Adapazarı station, Adapazarı
Stops	11
Distance travelled	107.1 km (66.5 mi)
Average journey time	1 hour, 15 minutes
Service frequency	6 daily
On-board services
Disabled access	Yes
Seating arrangements	Coach
Catering facilities	No
Technical
Rolling stock	TVS2000, E44000
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Electrification	25 kV AC, 50 Hz
Operating speed	90 km/h (56 mph) (average); 140 km/h (87 mph) (max)
Track owner(s)	TCDD
Route map
Route map
	Legend
	19.7 km
	12.2 mi
	39.3 km
	24.4 mi
	49.3 km
	30.6 mi
	59.4 km
	36.9 mi
	66.8 km
	41.5 mi
	75.3 km
	46.8 mi
	Kocaeli
	Sakarya
	99.1 km
	61.6 mi
	107.1 km
	66.5 mi
	113.5 km
	70.5 mi
	115.9 km
	72 mi
	This diagram: view; talk; edit;

The Ada Express (Turkish: Ada Ekspresi) is a limited stop regional train service operating between Gebze, Kocaeli and Adapazarı. It was inaugurated on 5 January 2015 as a replacement for the popular Adapazarı Express train service. However, unlike its predecessor, the Ada Express ^[2] does not make local stops and run as often and it does not operate into central Adapazarı. Trains mostly consist of TVS2000 cars and use E68000 series locomotives for motive power. Turkey's National Electric Train has also been in use on the Ada Express since May 27, 2023.^[3]