The Yoa2 was a Swedish four-piece electric railcar, which was from Statens Järnvägar (SJ ) procured by the year 1960. Very soon, the trains were called because of their color Paprikatåg ( Paprikazug ). After the introduction of the new series marking at the SJ in the 1970s, the railcar was run as X9.
The trains were manufactured 1959-1963 by Hilding Carlsson Mekaniska Verkstad in Umeå, the electrical equipment was in ASEA. The concept was adopted supplied by the mid-1950s to the TGOJ railcars of series X20/X21. SJ had placed an order at this time for narrow-gauge railcar at Hilding Carlsson, these vehicles but no longer needed. Therefore, it was in an order of 14 standard gauge railcar units, consisting of a motor car, and trailer converted.
In contrast to the X20/X21 the X9 had just fronts to create a more stable structure. The cars were not permanently coupled and so these could easily replaced or train length can be varied. The original contract was amended so that eventually 23 trains were delivered. The series name was changed after the 1970 reorganization of the series carried out in X9A/X9B for railcars and UA9, UAB9 and UB9 for the middle car.
The first train was delivered in late 1959. The railcar units still got the old Swedish design label Yoa2. Great attention has been paid to comfort. The interior was designed as a salon and there was a folding serving table and foot rests on each seat
The name Paprikatåg came from the exterior painting of the trains that were painted in bright orange-red. The roof was originally green. A multiple unit consisted of four parts, which usually in the car sequence X9a UA9 UB9 X9b wrong.
Overall, Hilding Carlsson built following railcars and trailers:
The trains were used primarily as high-speed trains in southern Sweden, especially in parts of Skåne and around Gothenburg and also traveling between Stockholm and Dalarna. They quickly became popular with passengers because they offered for that time very high level of comfort. The trains were given names like Mälardalen, Siljan or Östergyllen, these names were attached to the railcar fronts.
During the 1970s, the Dalarna trains were moved to Skåne and around Gothenburg and drove on routes Malmö and Helsingborg Helsingborg Hässleholm Kristianstad. The name badges have been replaced by the SJ character.
1987 disappeared the railcar from long-distance transport and Borås Varberg were used only in local transport to Gothenburg as on the route Gothenburg - Strömstad and Viskadalsbanan. The railcars were given a new coat of paint, which significantly altered the appearance of the trains.
In the 1990s, the shutdowns of the trains began the last of its type was decommissioned in 1999.
Today only one unit with three cars ( X9A 137 2352 UB9 X9B 138) at Svenska Motorvagnsklubben.