I'm glad you enjoyed it (or were mesmerized by it)! It came to my attention from a young woman in northern Germany via her aunt, an acquaintance in my area who raises and sells flowers at the local farmers' market. She's there every week without fail, except for one week when the neighboring vendors minded her stall while she was out of town at her American naturalization ceremony.You have a lot to answer for! Just sat and watched/listened to the scrolling score by GeruBach three damn times. Absolutely beautiful.
They may be real. A friend sent it to a friend of hers who has traveled widely all over Europe and the UK. He has perfect pitch and a very good memory for sounds. He replied that he had always heard different trains as having unique-sounding horns. In his opinion, they were real train horns.If they were real train horns, then someone put a lot of work and effort into it. Magnificent!