is a long distance electric multiple unit developed by Polish rolling-stock manufacturer Pesa SA.

In 2006 the Acatus was introduced, which was later developed into a series of 14 Bydgostia units, first ordered by Przewozy Regionalne and now operated by PKP Intercity.

In the later years, the Elf family expanded to include 2-, 3-, 4- and 6-section EMUs for operation on metropolitan and regional services.

[1] On May 24, 2014 PKP Intercity signed a contract with Pesa for the delivery and 15-year maintenance of 20 Dart units.

Jakub Gołębiewski also worked on the interior, while Mariusz Gorczyński designed the driver's cabin.

Miłosz Pszczóliński and the Kaniewski Design firm also worked on creating the Dart.

The Dart was officially presented to the public during the Trako 2015 trade fair on September 22.

The body is made out of high-strength steel and compsite materials, it meets the requirements of the EN 15227 norm (Four collision scenarios).

The train is disabled-friendly, featuring a lift, designated wheelchair spots and an accessible toilet.

The train is equipped with air conditioning, electrical sockets under the seats, Wi-Fi, video surveillance and electronic route displays.

[30] In the first month of service, the new Pesa trains made 247 trips, during which they traveled 69000 km and transported almost 45000 passengers.