Thomas is extremely heavy and powerful. So he is capable of pulling lots of freight on his own.
Thomas is 2 blocks shorter than a standard locomotive, so you will have to place your inserters/pumps closer to the stations.
Sending Thomas to his station first makes it easier to place your loading setup.

ONLY WORKS FOR HIGH RES, I might add low res sprites later. If you load in low res, it will show a diesel sprite with Thomas stats.
I will add correct shadows later.

Known bugs:
GUI plays duplicate music
Thomas does not connect directly with other Thomas'

Thanks to agepbiz on Youtube for the model.

And please, look both ways before crossing Thomas's tracks.