Regionalbahn Bern-Solothurn RBS is a company that runs buses and also a narrow gauge network of 1000 mm gauge close to the capital city Bern and between Bern and Solothurn. RBS was founded as a fusion product of Vereinigten Bern-Worb-Bahnen (VBW) and the Solothurn–Zollikofen–Bern-Bahn (SZB) in 1984. RBS operates three S-Bahn lines close to Bern (S7 Bern-Worb Dorf, S8 Bern-Bätterkinden, S9 Bern-Unterzollikofen) as well as a longer so called Regionalexpress or RE service between the cities Bern and Solothurn. All these metre gauge lines operate with 1250 V DC. In addition to these RBS also owns the track and part of the rolling stock running the Bern tram line no.6, formerly tram G, to Worb Dorf. That one runs with 600 V DC and uses currently partly RBS' trams and partly specially fitted Siemens Combino trams of Bernmobil, the company that operates the trams of Bern city.

This train is a Be 4/12 "Seconda". They were built out of an earlier series from the years 1991-93 which was called "La Prima". These La Prima trains were quite extensively modified 2010 to 2013 and among other changes they got a new middle coach and a thick rubber bumper band at their fronts.
Picture from Worblaufen depot 9.5.2023 by Ilkka Siissalo.

Another Be 4/12 "Seconda" just arriving at the Worblaufen station.
Picture from Worblaufen depot 9.5.2023 by Ilkka Siissalo.

A third picture of a Be 4/12 "Seconda" train.
Picture from Worblaufen depot 9.5.2023 by Ilkka Siissalo.

An earlier train of the type Be 4/8 nicknamed "Mandarinli" (small mandarin). These trains were built 1974-78.
Public domain picture from Worblaufen by Wikimedia user "plutowiki" 7.11.2018.

This is now the next generation of RBS' short distance S-Bahn trains, a Be 4/10 "Worbla". These trains have been built by Stadler 2018-19.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.

A closer look at one of the new Worbla trains.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.

A new Worbla train loading passengers.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.

This train is of the type RABe 4/12 "NExT" built by Stadler 2009-13. These are currently used only on the RE line between Bern and Solothurn. This RE service does not stop at Worblaufen, so we see here the train in full speed.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.

Another RE service between Bern and Solothurn composed of two of the type RABe 4/12 "NExT" units rushing through Worblaufen.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.

Still one more picture of the new RABe 4/12 "NExT". As can be seen, it's a three-coach train with each coach about 2/3 low-floor, including all the doors. The design doesn't even faintly resemble any other new trains made by the same manufacturer Stadler.
Picture from Worblaufen 9.5.2023 by Ilkka Siissalo.