I decided to name this voicebank as 電歌シャー(Denka Shaa).
電車(densha, train)+歌(ka/uta,song)-> 電(den, electicity)歌(ka)シャー(from 車)
Also, I suppose the original horn sound belongs to 2ТЭ10У-0337. There's no good photo of this guy, but here's how 2ТЭ10У series looks like