I’ve been building some “foreign” stock for the goods depot at Farthing. It’s a real pleasure, but also humbling to realize just how little I know about other companies, and how difficult it can be to obtain kit parts for other pre-grouping companies. We GWR modellers are a spoilt lot!   My 1900s period is before the “common user” arrangement, so most of the goods stock at Farthing would have been the GWR’s own - but there should be room for a handful of foreign vehicles, especially fr