Just came downstairs from the train room to test my three PS1 engines for you
Two I started at 9V and then took it up to 14V for over a minute to "charge" the BRCs,
Then when bringing the throttle below 10V {9V}to take off in, they make a air whoosh sound then a single dink of the bell.Then hit the direction button and off it goes
The other I started it at 8V and let it sit there at 8V and after a minute hit the direction and off it went
Let me know the outcome of whats going on,I Have PS1s and PS2s,and a few PS3 (I like my PS2s the most,followed by my PS1s}
I've had my PS1s along with the two Z4000 for over 20yrs now,most of those years with the BRCs and they have worked great
Good luck and let me know