Wheel_on_“Peggy,”_a_Lima_Shay_Geared_Steam_Locomotive_(SN_2172)
Steven Fine
CC-BY-SA 4.0
Science, Technology and Engineering
Geralt
CC BY-SA 4.0
Clock gears
Przemek Pietrak
CC BY-SA 3.0
KFNB_AJAX_TMW_detail_2018-07-21-crop
Herbert Ortner
CC-BY 4.0 (cropped)