They are the Ffestiniog Railway’s 40HP Simplex (once known as Mary Ann) and Moelwyn – the UK’s only surviving example of one of the Baldwin tractors which were very popular with American and Canadian forces during WW1.
Being FR locos, their wheel standards are alsightly incompatible with the railway at Apedale – so they MAY be static display or very limited operation – testing will decide. There’s still just a few days to buy advance tickets.
Source: Moseley Railway Trust – Latest News