![Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains](https://i.redd.it/n56p6tak8yw81.jpg)
Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains
![Details Of Steam Locomotive Wheels And Wheels Mechanism Stock Photo, Picture And Royalty Free Image. Image 115525001. Details Of Steam Locomotive Wheels And Wheels Mechanism Stock Photo, Picture And Royalty Free Image. Image 115525001.](https://previews.123rf.com/images/rashpil/rashpil1901/rashpil190100010/115525001-details-of-steam-locomotive-wheels-and-wheels-mechanism.jpg)
Details Of Steam Locomotive Wheels And Wheels Mechanism Stock Photo, Picture And Royalty Free Image. Image 115525001.
![Old steam locomotive engine wheel and rods details, Stock Photo, Picture And Royalty Free Image. Pic. WR1027041 | agefotostock Old steam locomotive engine wheel and rods details, Stock Photo, Picture And Royalty Free Image. Pic. WR1027041 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/c6d1e6f7a3d463fc9c40d7ee346c0db6/wr1027041.jpg)
Old steam locomotive engine wheel and rods details, Stock Photo, Picture And Royalty Free Image. Pic. WR1027041 | agefotostock
![Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains](https://i.redd.it/4ss34tak8yw81.jpg)
Why do steam engine wheels have these hemisphere bits parallel to the coupling rods? Why are some bigger than the others? : r/trains
![rail - What is the purpose of these “partially filled in” locomotive wheels? - Engineering Stack Exchange rail - What is the purpose of these “partially filled in” locomotive wheels? - Engineering Stack Exchange](https://i.stack.imgur.com/JbStW.jpg)