Search web for Union Pacific AC4400 Horn Type
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UP uses both Leslie and Nathans, but has been favoring Nathan "K" series 3 chimers (K3LA and K3HA) on modern units from the 1990s. On many of the newer units UP has also been ordering Nathan K5LLA and K5HL horns.
Any K3LA and K3HA horn asset will work. Just edit cfg file, don't forget to edit kuid table .
I would like to help but you have to tell me the type of missing asset
I have up4400ac 100% error and warning free by 2 freeware authors.
I had to substitute and update assets to get them to work.
I don't remember the substituted assets.