All the necessary dependencies are either included in the package or are avaible on the DLS.
The 125 series is an electric railcar (technically speaking not an EMU, as there is nothing “multiple” here) introduced in 2003 by JR West for off-peak services on rural local lines in eastern Kansai.
18 vehicles were manufactured by Kawasaki between 2002 and 2006, divided into three batches:
1st (2003) – 8 vehicles for the newly electrified Obama Line.
2nd (2004) – 4 vehicles for the newly electrified Kakogawa Line.
3rd (2006) – 6 vehicles for the re-electrfied (20Kv AC to 1.5Kv DC) Nagahama to Tsuruga section of the Hokuriku Main Line.
Conceptually similar to JR East’s 701 series, they are based on the 223-2000 series bodyshell.
They have a max speed of 85 Km/h (1st and 2nd) or 120 Km/h (3rd). Their traction system is an IGBT-VVVF inverter manufactured by Toyo Denki, quite common among JR EMUs.
As they were designed for driver-only operation (“wanman” as it’s known in Japan) from the start, only two doors are necessary* so the would-be central one is a dummy (altough easily convertible if the need ever arises).
Another notable fetaures of the 125 series (like the afromentioned 701 series) is the large weelchair-accessible toilet, wich takes almost 1/8 of the total space avaible for passengers.
Being designed for off-peak services on rural lines, they normally run in single-car formations (especially on the Kakogawa Line, where more heavily utilized services are assigned to the 2-car 103-3550 series trains, rebuilt from original JNR 103 series stock) or in two-car sets (mostly on the Obama Line, after the retirement of the 113 series in 2006).
Theoretically they can be coupled in multiple up to 5-car sets (maximium platform capacity of both the Obama and Kakogawa Main lines) and more.
* on Japanese driver-only trains you have to enter from the rear door and exit from the front one after paying the fare to the driver, in the same way as it’s done on a tram or bus.
On 2nd batch 125 series trains, the compressed-air-working toilet is identical to those used on 300 serie shinkansen trains.
The 125 series costs one million yen per car (~92300 USD or 82600€); 3rd batch trains were entirely paid by the prefectural governments of Fukui and Shiga.