[citation needed] The third formation (KiHa 3519-3518) was stored at Tayuman shed and is used as a spare car from 2015 to 2017.

After two years, it entered service in September 2017, but it takes only one or two round trips a day because of its existence as a spare car.

On 1 August 2018, PNR KiHa 350 Set 3 was used for the soft opening of the Caloocan-Dela Rosa Line.

[9] On 16 October 2020, DEL 5009 hauled KiHa 350 Set 3 on its transfer to Naga, Camarines Sur, Bicol.

[11] In 1999, Aizu Railway bought a surplus diesel vehicle from JR East's KiHa 30-18 which was supposedly to be scrapped in 1996 to be modified & converted as a sightseeing diesel car and reclassified as AT-300 series rolling stock.

It was remodeled inside Niigata, Japan into chartered-type train which attract tourists to generate better income due to the number of passengers decreased due to the economic slowdown in the late 1990s and the impact on the local economy was large, so it was necessary to take measures to increase transportation demand, such as Okawa Valley It was planned to introduce additional trains for the purpose of appreciating the scenery along the railroad .

Due to the business situation of the Aizu Railway, it was difficult to introduce sightseeing vehicles on its own.