My son received the MTH passenger station for Christmas. It was the Orange one... I normally see most people seem to have the red one. We decided to dress it up a little so it does not look so orange and instead try for an old brick style.
I used Spackle to fill in the grout lines. After it dried, I used a bristle brush to remove excess but leave a powdery film on the brick. I also used some dark watered down paint to dull the roof and brown watered paint to weather the platform.
It was fun to do... The only challenging part was properly replacing the windows. When I removed them I was not aware that the first story windows are very slightly larger than the second story windows.
Some pics attached.
Ron