After reading RetroRails12 problem I tried some experiments.
(1) One RR Mods CP ES44AC and one Jointed Rail CP SD70ACU - No random bell sound
(2) Two RR Mods CP ES44AC units and one Jointed Rail CP SD70ACU and was been able to replicate the problem RetroRails12 is talking about fairly easily.
(3) One RR Mods CP ES44AC on it's own and no random bell sound.
(4) Two RR Mods CP ES44AC units/consist does produce the occasional random bell sound.
(5) Two RR Mods locomotives of CP AC4400CW/CP ES44AC combination and no random bell sound
Conclusion: For me one RR Mods ES44AC locomotive unit on its own or in a consist with other RRmods types of locomotives or other 3rd party locomotives no problems, but two or more ES44AC units and the random bell sound starts. Experiments were done on a route I'm currently building that contain no whistle posts or track triggers etc at this stage.
Trainz 2019
Build 117009