One of the best pieces of 5ft motive power in TT scale is the M62 made by Austrian manufacturer Roco.

https://www.flickr.com/photos/jpachl/17041100376/in/photostream/player/

The close-up picture shows the excellent quality of that model in a tabletop photo setting. Keep in mind how small a TT scale loco really is. The passenger coach in the background in the paint sceme of the 'Red Arrow (красная стрела)' express train was made by Russian manufacturer Peresvet as a limited edition. While the prototypes of this specific locomotive and the Red Arrow coaches were used in the Moscow-Leningrad region (the October Railway district), the background photo I used for this setting rather looks like from a Southern region of the former Soviet Union. However, the models fit well to this background, and you never know what might have happened in reality.

Joern