Other mistake: When Percy meets Thomas at Elsbridge Station, he has a water line across his boiler, even though the water only came up to his footplate.
Other mistake: Edward is wearing James' sad face mask when he approaches the water column.
Other mistake: In the distant shot of Vicarstown, the station is missing its letters.
Snow Engine - S7-E14
Other mistake: Before Oliver crashes, no-one appears to be inside his cab in a shot of him passing a crossing.
Answer: He was in the water.