Besides nice looking cars, the tracks are well ballasted, too.
Just one comment about the B23-7. In the picture you can see the the see-through part of the decals (called silvering) that distracts from a nicely painted model.
Did you use Micro-Sol after the decals were applied and dry? If not, it is not too late to drench it at least 4, 5 times. Use a soft hand brush for that. This will soften the decal and pull it closer to the paint and into the grooves.
You always should put 2 or 3 glossy coats on every model you decal to create a smooth surface, apply the decal, and than coat it with gloss, satin or flat.
I did a little tutorial on detailing, painting and decaling models and you might want to check out the decaling section.
detailing