iPhone 7 and iPhone SE, I made it stereo by putting the iPhone 7's audio on the left channel (The raw video's audio) while the iPhone SE recording on voice memos, putting it in the right channel then. No external mics used, it's purely from the devices, Combined on audacity. You need two devices to achieve stereo audio specifically the iPhone 6S, SE or 7 to make it sound like this because the iPhone 8 above models seems to be weaker in louder noises. I don't know about the iPod's Touch Mic but you might still achieve this kind of audio specifically on A9/A10 chip apple devices.
- Kereta Yang diekspor ke Philipina 1 . seperti nya tidak mendapatkan Perawatan Setelah Dinas/ Tahunan,Bulanan Kenapa saya ngomong begini karena Terlihat Dari kondisi Kaca kereta yang Kotor Dan body kereta
If you're referring to the locomotive shown exactly on the video clip at 2:57, that's not even 918 at all. The next clip after 2:57, that's 918. Plus, 918 didn't even had a trainmeet at that part (3:34), and no "inka rotem" (as you have stated) showed up on neither of the two video clips. The next clip after 918, is not an inka rotem, that's a Hyundai Rotem DMU (at 4:20).