By the early 20th century iron wheels were the default offered by most manufacturers with wooden wheels being a cost-option. Foster seemed to really push wooden wheels, and so more 20th century Foster machines were supplied with (and thus survive) with wooden wheels than probably any other manufacturer.
It is reasonably common for a medium-weight 20th century domestic-market Foster machine to be found with wooden wheels. Not so with examples from any of the other major manufacturers.
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