What air horns for UP diesels 70's & on?

Model Railroader Prototype information for the modeler
1

Hi folks,
Was curious what type of air horns were used on the U.P. diesel locomotives from the 70’s to modern day. I believe that it is a Leslie S5T-RR. Could anyone out there correct me if I am wrong. As always thanks to the forum for the help.
Regards,
Brad

2

From George Cockle’s “Union Pacific 1977-1980”:
GP38-2, U28C, U30C, C30-7, GP40X - Leslie S3-LRF