[2] On February 4, 1978, the carrier hired German unit 627 008 [pl] for two weeks of test runs, after which they began looking for a supplier of new rolling stock.

The first manufacturer's proposal of Ym wagons was rejected due to outdated design and excessive fuel consumption, while the VT2E vehicles offered by the second factory were dropped because of insufficient parameters and too high a price.

Its parameters were deemed appropriate, and the vehicles for the Dutch carrier were made similar to the Deutsche Bahn railroad's 627 and 628 class cars.

[4] In November 1982, there were problems with the electromagnets installed in the bogies, which misread commands and spontaneously changed the settings of the ground safety system devices.

Initially, 17 DH1 wagons and 29 DH2 units were planned to be purchased, but eventually fewer vehicles were delivered to Poland due to the ordering company's financial difficulties.

New headlights, a fire alarm system and an audible warning signal were installed, as well as automatic train braking, a radio-stop with radio-telephone, a dead man's switch, an electronic speedometer, and tilt steps to enable 300 mm high platforms.

After the repair, combined with modernization, polonization and replacement of selected components with new ones, ZNTK Poznań obtained approval of DH1 and DH2 vehicles and estimated their service life at about 10–15 years.

[6] In mid-2012, Koleje Śląskie became interested in the Wadlopers, as at the time they only operated one line, and as of December of that year they were supposed to be entrusted with carrying out rail passenger services in the entire Silesian voivodeship.

[25] Subsequently, Koleje Śląskie established a subsidiary company, Inteko, which was responsible for, among other things, mediating the carrier's rolling stock matters.

However, Inteko did not have the means to repay the debts, so the Upper Silesian Waterworks Company received the right to, among other things, four Wadlopers as a result of the transfer.

[23] On July 23, 2013, the Upper Silesian Waterworks Company became the owner[5] of unit SN83-003,[4][15] and in September and December of the same year, two unmodernized vehicles set aside at H.

[5] On January 27, 2015, the Bailiff at the District Court in Brzeg announced that on February 5, one DH1 wagon (SN82-002) and two DH2 unit (SN83-003 and 004), among others, would be put up for auction[26] at the siding of the liquidated Przewozy Regionalne's Silesian Company.

[31] On June 30, 2016, the Upper Silesian Waterworks Company made its first attempt to sell two vehicles set aside at the H. Cegielski plant.

[34] On December 29, the company again put these vehicles up for sale, but this time in the form of a tender with the deadline for bids set for January 13, 2017.

[17] On April 14, 2017, meanwhile, the Upper Silesian Waterworks Company announced an auction on May 4 for, among other things, vehicle SN83-003,[36] which was ultimately not sold at that time either.

The proposal of the carrier SKPL Cargo was considered the most favorable, and they eventually bought the SN83-003 unit and the other two vehicles owned by the Upper Silesian Waterworks Company.

[41] In 2019, SKPL increased its fleet of Düwag Wadlopers by purchasing SN83-004 and SN82-002, which was then transported on July 5 from the Koleje Śląskie's base in Katowice to Zagórze for repairs.

[20] At the end of January 2022, as part of the 30th finale of the GOCC campaign, the opportunity to give its name to unit SN83-001 was donated to the charity.

[47] The vehicles ran on Koleje Dolnośląskie services from February until the end of April, when their lease was suspended due to COVID-19 pandemic restrictions[48] until September 7, when both vehicles returned to Lower Silesia, where they were operated for a year until SN83-003 was transferred to Polregio's facility in Podlaskie Voivodeship and SN82-002 to a facility in Pomeranian Voivodeship.

Ultimately, the rental of Wadlopers is expected to improve travel comfort due to the fact that these vehicles are more capacious compared to the younger Tramps, which can carry no more than 50 passengers.

[54] In mid-2009, when Poland's Sigma Tabor was unable to purchase the original number of Dutch vehicles for financial reasons, the railroads of Argentina and Uruguay also placed an order for them.

[2] On the last weekend of July, 2011, unit 3203 was transported to the station in Concordia,[7] from where it embarked on a test run to Salto on August 6.

[55] On August 29, 2011, the presidents of the two countries, Cristina Fernández de Kirchner and José Mujica, held a ceremony at the Salto train station to inaugurate a cross-border service called the Train of Free Nations (Spanish: Tren de los Pueblos Libres).

Train number 3201, with authorities on board, left Pilar at 8 am, arrived in Basavilbaso at 2:40 pm, and continued on to Paso de los Toros 10 minutes later.

At around 6:30 pm, at a rail-road crossing in Concordia, a cab traveling along De los Viñedos Street hit the unit, numbered 3221.

With the beginning of November 2011, the route was shortened to Paysandú, and in March 2012 services were again limited to the Pilar – Salto section.

[9] In addition, due to an accident on February 22, 2012, in which 51 people were killed, the operator lost its license, which led to the decision to suspend the route.

[59] On November 8, 2016, the auction of ten DH1 wagons belonging to bankrupt carrier Trenes de Buenos Aires was announced.

[12] Under an agreement between the private company and the state-owned carrier,[10] this route across the San Roque González de Santa Cruz Bridge[12] is operated by Trenes Argentinos[10] with two Casimiro-owned DH2 units.

[66] From July 8 to 13, 2015, trains ran around the clock due to increased traffic caused by Pope Francis' visit to Paraguay's capital Asunción.