Yellow Thomas Coach???

No problem, glad you picked up a great deal Super.

In TOTAL, there are 10 variants that I know of. If I have missed out any please let me know so I can update this post!

Just for record here are all the variants of the "coach" mould:

Red branch line coach with light grey roof - available with either Oliver as a 3 pack, 2 of them included; or in the MR&R Roller Coaster Mountain Set still with Oliver and 2 of them included.
EU & AU: 1999 - 2001; 2001 - 2003; 2003 - 2005; 2005 - 2008; 2008 - 2009
Plarail: 1999 - 2003; 2003 - 2012
Included in the MR&R set: 2007 - 2008
Available from: Plarail, Tomica World, Motor Road & Rail, TrackMaster TOMY

Red branch line coach with black roof - only available with Sir Handel as a 3 pack, 2 of them included.
EU & AU: 2007 - 2008; 2008 - 2009
Plarail: 2007 - 2012
US: 2008 - 2009
Available from: Plarail, Motor Road & Rail, TrackMaster HTC, TrackMaster TOMY

Blue branch line coach with grey roof - only available with Rusty as a 2 pack.
EU, AU & US: 2010 - 2012
Available from: TrackMaster FP

Blue branch line coach with blue roof and "Sodor Electric Co." banner on right side - only available with the Toby's Electric Co. Delivery 3 pack.
EU, AU & US: 2012 - 2013
Available from: TrackMaster FP

Olive branch line coach with dark grey roof - available with either Splatter as his own 3 pack, or with Dodge as his own 3 pack.
US: 2008 - 2009
Available from: TrackMaster HTC

Yellow branch line coach with grey roof - only available with James as part of the James Figure 8 Set.
US: 2009
Available from: TrackMaster HTC

Blue narrow gauge coach - available with Skarloey as a 3 pack, with either 2 of them included or with only 1 of them included along with a black caboose, or with Skarloey and only one them included along with two half straights.
With 2 blue narrow gauge coaches:
EU & AU: 2006 - 2008; 2008 - 2009
Plarail: 2006 - 2012
US: 2006 - 2007; 2007 - 2009
With 1 blue narrow gauge coach and black caboose:
US: 2008 - 2009
With 1 blue narrow gauge coach and two half straights:
US: 2007 - 2009
Available from: Plarail, Motor Road & Rail, TrackMaster HTC, TrackMaster TOMY

Red narrow gauge coach - available with Rusty as a 3 pack, with either 2 of them included or with only 1 of them included along with rusty S.C.Ruffey, or with Rusty and only one them included along with two half straights.
With 2 red narrow gauge coaches:
EU & AU: 2006 - 2008; 2008 - 2009
Plarail: 2006 - 2012
US: 2006 - 2007; 2007 - 2009
With 1 red narrow gauge coach and rusty S.C.Ruffey:
US: 2008 - 2009
With 1 red narrow gauge coach and two half straights:
US: 2007 - 2009
Available from: Plarail, Motor Road & Rail, TrackMaster HTC, TrackMaster TOMY

Emily's dark green coach / coaches with black roof - only available with Emily as a 3 pack, with only 1 included.
EU & AU: 2004 - 2005; 2005 - 2008; 2008 - 2009
US: 2007 - 2009
Available from: Motor Road & Rail, TrackMaster HTC, TrackMaster TOMY

Red "express" coach with black roof and red chassis - only available with the black roof red caboose, as part of the Express Coaches 3-truck-pack, 2 of them included.
EU, AU & US: 2010 - 2012
Available from: TrackMaster FP