I recently learned about the Marx "wedge tender", which is wider at the front than at the back. I can imagine how it was intended to make the differences in width between loco and cars less obvious. I have a Marx wind-up #597 loco which is obviously much wider than the typical Marx cars of that era.
I'm interested to know when Marx made the "wedge tender", and what were typical components of sets that included a wedge tender. Also interested to know the general dimension. I haven't had any specific results with searches. Thanks for any info ...