These 2 are bogus autographs. There are literally hundreds more.
You can find this crap pretty much 24-7-365 on eBay and other auction sites. The sad part is that some of these images are really nice and deserve better than to be parlayed into a scam.
Note the two examples above – the signatures aren't even close. That's how pathetic many of these attempts at fraud really are. It doesn't take a specialist to spot 'em.
BTW, both of the items seen above came with a COA (Certificate Of Authenticity). Trust me, that's actually easier than faking the autos. Inside of ten minutes I can produce a very nice, and very believeable, COA telling you that you own the Golden Gate Bridge. I can even add an embossed gold foil seal that says "Certified Genuine". (I'm a graphic designer - this kind of stuff is easily available to industry insiders - in case you were wondering)
Finally, don't believe just because the seller is a member of an "official association" that they aren't passing off bogus material. All it takes is a few bucks and you too can be "certified" by these rubberstamp groups. They don't do jack even if you report a fraudulent sale.
I encourage you to purchase only legitimate autographed items. Pack-inserted genuine Thomas autographs are readily available for around $25-$50.