Weaver evolved over time with what was available. Early engines featured just a reverse unit. Some early models have QSI sound and eventually they went to TMCC. Started with TA Studios SAW boards and the last ones had EOB. The final runs came with ERR boards. Sounds were pretty basic and generic. The smoke units varied. Check the end flap on the box. What’s inside as far as components is usually listed.
As far as working on. Not bad. Well made. Like anything brass. Careful handling is a must. But I wouldn’t consider them overly fragile. The engine shells generally remove easily and almost all the electronics as far as boards reside in the tender. I own a couple of New Havens. I5 Hudson and I4 Pacific. The Pacific is a beauty with a lot of added detail and has ERR. Sounds are basic. The Hudson came with a TA board. I added EOB and a better sounding Rail Sounds board. Both are good runners.
