In the comic books, anything is possible, and Bumblebee goes steampunk, and becomes a steam locomotive

https://www.abebooks.com/servlet/BookDetailsPL?bi=30963309706&ref_=ps_ggl_17721428148&cm_mmc=ggl-_-US_Shopp_Trade_20to50-_-product_id=COM9781600100550USED-_-keyword=&gclid=CjwKCAiA9dGqBhAqEiwAmRpTC147-UVmFE3-3v6SvgIRIQrxKS4_4sn7TOVzG1lgH8cWgM2uXB2MihoC2-sQAvD_BwE

https://tfwiki.net/wiki/Hearts_of_Steel

https://screenrant.com/transformers-hearts-steel-bumblebee-steampunk-train-form/