Don't think the Hector with red coach should count as the only way we know its the rare version if it is BNIB. I think this list should only compromise of stuff that has the same rarity loose as well. The Spooky Stanley shouldn't count as we have never seen one in someones hands, and was never released.
From your list here is a list from rarest to least rarest
1. Lion of Sodor
2. Flip-Face RC Celebration Thomas*
3. Black Wheel Rim Buster
4. Hit Toys Face Slippy Sodor Thomas
5. Snow-Covered Freddie*
6. Alfie
I also have a firm belief that prototypes should also not be added to the list. Although we know that they're the rarest, they were never given the chance to be available to the general public, or available in stores making it only the people who either work in the factory, or have contacts that work there are the only ones able to get them. Furthermore, there is a prototype for every single item that has been made, and the ones you've mentioned @TrainsRawesome are the only ones to get into collectors hands, meaning if you want a true list with prototypes included, you'd need to include the prototype of every single item made in HiT Toys and Fisher Price history which isn't feasible. I also think that the RC Party Flags Thomas is a prototype too because we've only ever seen one, and no production packaging for it either, which is why I've excluded it. Therefore the list I will abide by will be this.
1. Lion of Sodor
2. Black Wheel Rim Buster
3. Alfie
4. Monty
Prototypes:
- Flip-Face RC Celebration Thomas
- Hit Toys Face Slippy Sodor Thomas
- Snow-Covered Freddie
Although the prototypes have been excluded from the list, we can list all the known prototypes in collectors' hands at the bottom of the list just so others who read this know they exist too.
Anyone is welcome to add to this list to get it going so there is more to abide by
From your list here is a list from rarest to least rarest
1. Lion of Sodor
2. Flip-Face RC Celebration Thomas*
3. Black Wheel Rim Buster
4. Hit Toys Face Slippy Sodor Thomas
5. Snow-Covered Freddie*
6. Alfie
I also have a firm belief that prototypes should also not be added to the list. Although we know that they're the rarest, they were never given the chance to be available to the general public, or available in stores making it only the people who either work in the factory, or have contacts that work there are the only ones able to get them. Furthermore, there is a prototype for every single item that has been made, and the ones you've mentioned @TrainsRawesome are the only ones to get into collectors hands, meaning if you want a true list with prototypes included, you'd need to include the prototype of every single item made in HiT Toys and Fisher Price history which isn't feasible. I also think that the RC Party Flags Thomas is a prototype too because we've only ever seen one, and no production packaging for it either, which is why I've excluded it. Therefore the list I will abide by will be this.
1. Lion of Sodor
2. Black Wheel Rim Buster
3. Alfie
4. Monty
Prototypes:
- Flip-Face RC Celebration Thomas
- Hit Toys Face Slippy Sodor Thomas
- Snow-Covered Freddie
Although the prototypes have been excluded from the list, we can list all the known prototypes in collectors' hands at the bottom of the list just so others who read this know they exist too.
Anyone is welcome to add to this list to get it going so there is more to abide by