Rail Baltica's largest rolling stock depot is designed by NORD PROJEKT AS and Reaalprojekt OÜ.

The depot will primarily repair and maintain trains terminating at the Rail Baltica Ülemiste passenger terminal, but the depot must be ready to provide maintenance and repair services to the rest of the Rail Baltica 1435mm gauge train fleet. The Ülemiste rolling stock depot must allow parking of the passenger fleet and other necessary functions. As part of the construction, the contractor will also design the warehouses, technical rooms etc. necessary for servicing the traffic control centre, administrative building, and depot.

According to the Rail Baltica’s operating plan, the depot for the maintenance and repair of passenger vehicles can accommodate 7 trains; 26 high-speed trains and 16 regional trains will run on the infrastructure.

The design cost of the depot is amounted around 1,86 million euros.