Hello I have lost the instructions for the Tomy Thomas and friends train set, 120 pieces, Blue and gray track

the set you're talking about is called the tomy thomas big loader set you can probably find the instructions off google images

roller coaster mountain is one big piece with a small removable castle and removable flag. if you have all these, all you need is the various track. you can look up this set on trackmaster thomas wiki and it will give you a list of the pieces.

on the box it should state manufacture contact them and ask for the instructions should be no problem

Try looking for your set here and downloading the manual

http://www.tomy.co.uk/webcare/product-instructions/track-master-tmrr-instructions/

http://tomicaworld.wikia.com/wiki/7404_Thomas_Giant_Set

http://www.tomy.co.uk/webcare/product-instructions/track-master-tmrr-instructions/

Steven,

The Fixya website has absolutely nothing to do with Tomy. My recommendation is to direct your question to Tomy directly here:
Contact

http://www.tomy.co.uk/webcare/product-instructions/track-master-tmrr-instructions/

Tomy UK Web site has manuals to download. http://www.tomy.co.uk/careline/product-instructions/thomas-product-instructions/
Cheers