Thomas whistles in his sleep. Whistling takes steam, but an engine at rest for the night would not have a lit fire.
Toby is pushed onto the coal tipper, but even though the tipper goes at a 45-degree angle Toby does not fall off.
Mavis was inviting the diesels to the coaling plant, so why would Thomas even worry about inviting Diesel 10 when Mavis should be doing it?